What’s the best prank in uniform you've seen? Comment below!

a Relative Bearing, is an Angle Off the Bow while a ship is Underway.
A Standard prank for noobs, was to send them for a can of Relative Bearing Grease.
There Actually is a Relative Grease Company and a guy had gotten his hands on a one pound can of Bearing Grease from them.
When he reported aboard, and was instructed to get a Can of Relative Bearing Grease, he went to his rack for a few additional hours of sleep, and after lunch reported back to his Leading First Class with a Can of Relative Bearing Grease

1. Late 80s missile field had a cook that like to jet dry peoples food his last shift we took the door off the hinges to his kitchen pull a $20 out of his cash box put $19.99 back into it laid a penny on the floor right by the door, but the door backs on its hinges The next morning he freaked out because he thought he lost $20.00
2. Mid 90s working on the ramp overnight. Maintenance left one of the C1 30s on the taxi way to the hot ramp someone on days had signed a bunch of tickets and left the book in the patrol car. I took one of tickets and put it under the windshield wiper of the C130 the next day, they were all up in arms, wondering how someone got into a locked aircraft

I was stationed in Germany and we were doing Soldier readiness getting ready to deploy to Iraq. A butterbar who was new to the Batallion was behind my soldiers and I in line. he tapped me on my shoulder and asked if he could go in front of us in line because he had some paperwork he needed to finish. I said "No problem, Sir" He said "Thank you, Staff Sergeant." Before he moved in front of us in the line, I said this to him "Sir, before you get to the front of the line, you need to fix your rank.It's upside down and it wouldn't be a good thing if our BN commander saw you with your rank on upside down." He thanked me again and then he reached down and unvelcroed his 2LT rank and turn it 180 degrees and then put it back on. After the 2LT moved toward the front of the line, the PV2 next to me asked me "Hey SSG, how could you tell the LT's rank was upside down"? I told him "when and if you get to my rank, you'll know."
I'm not sure which was funnier: the Lt falling for that or the PV2 asking me how I could tell the 2LT's rank was upside down.

In the Air Wing of the Marines our favorite was to send the New Boot out for 10 Gallons of Prop Wash. (The force of air produced by a spinning propeller.) As it turns out, there have been some Propellers in history that had specialized cleaning required due to the materials used in making it. This one guy went to a local airport, bought some and brought a receipt looking to be rimbursed.

Back as a Captain in my residency at Eglin we had a rare slow night on call. We filled one of our colleagues offices with inflated rubber gloves . .
Like I said, it was a slow night!

While teaching AIT land nav, we had a very tight training schedule so retraining and retest was done on weekends. As instructors we hated it. So to motivate the students looked for a way to better motivate the students. Setting up the course one day I found a balloon with some sort of electronic package attached. I called the local airfield and they said it was probably a disposable MET monitoring sensor. Showing it to the other instructors we cooked up a Lost Student Locator LSL system. We got a full spool of 550 cord from the riggers and a new balloon from the air weather guys. We rigged a little blinking batteries with switch and a blinking light in the package and put it all into properly marked canvas knapsack. Last one to qualify land nav got to carry it everywhere the went until graduation. Each morning the class leader had to do a power on battery check. Needless to say some of those who carried it would be reminded of it by their peers years later.

While teaching at SWCS we would have pizza on days we knew the students had a late chow call. Then we'd stash the pizza boxes in the in air conditioned classroom where the smell would fill the room. By the time the fell out for chow they were drewling & ready to chew nails.

In boot camp one of the other platoons in our series senior DIs was known throughout the Corps as 'The Frog'. It was claimed he gargled each morning with Drain. As luck would have it we had a skinny recruit in our platoon who did a pretty good imitation of 'The Frog'. Needless to say we pranked his platoon repeatedly without him catching us. The would be formed up waiting outside the barracks or chowhall when random commands in his unique voice would come from behind them. Needless to say he was not happy when the were sent back in after he had just ordered them outout side.

Years later he had the Bn Recon PLT deployed with us. Our first day on ship at formation he checked the platoon berthing area and found cigarette butts. Approaching from the rear he in his own inimical way told Recon just #&@ing drop. Where upon several officers hit the deck and began pushing. They suddenly realized where they were and recovered. Who knew he'd trained officers too.

1969 basic Ft. Polk. New butter bar causing missory, so whats new! One night some people lifted the good mans new 69 orange Camaro onto a PT stand. You should have seen his face in the morning! Up and back down not a scratch or dent! No problems from him anymore.

Going to 'Nam on the APA Billy Mitchell with 5000 other Jarheads it was almost impossible to get into the main head after breakfast. Fifteen lines would form facing a metal trough with 15 toiles seats fixed side by side with fast flowing water rushing in from one bulkhead and out the other.
As it was crowded there was a lot of grumbling when one Marine would take a seat closest to the bulkhead with the water rushing IN and would pull out a newspaper, but in the interest of "just move along" not a lot was said.
The Marine with the newspaper would pop it open and prop it on his knees with one hand. With the newspaper covering his upper body he would use just the fingers of his other hand to crumple a single sheet of news paper into a loose ball.
Reaching into an upper pocket of his utility jacket he produced a cigarette lighter and, lighting the newspaper ball would quickly drop the flaming newspaper ball into the trough of downstream rushing water.
The loosely crumpled and flaming ball would be whisked away in the current under the bare backsides of 14 other "trough sitters" and the surprised expletives, oaths and singed hair never failed to make the rest of the troops in the 15 lines facing the trough howl with laughter.