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

As an Infantry Captain, stationed in Germany, I attended our Battalion "Dining In" (notoriously raucous affairs), celebrating the unit's birthday. Our S-2, making arrangements, took a recommendation, from a "buddy" of his in our rival sister Armor Battalion, for a local "young lady" to pop out of the huge b-day cake. The girl popped out and danced with various Lieutenants. The next day there was chagrin amongst us all, particularly the aforementioned dancing Looeys, and especially the S-2, when one Lieutenant reported to his friends that the "young lady" was, in fact, a female impersonator. The resulting hilarity in our "sister" Armor Battalion resulted in our delivering them a bruising 41-0 trouncing, in the next intramural football game, which we termed "The CakeWalk".

New hospital corpsman were sent to "sterile supply" to retreave a "sterile fallopian tube". Once there the supply Sgt began the never ending quest throughout the rest of the hospital. "Hey, just sent my last two to 2 West, check with them." I'm sure you know where this is going, 2 West sent them to ICU, who sent them to 4 East, who sent them on and on until either someone cracks or they return empty handed!

I put a spool of green string in my fatigue jacket pocket before company inspection and put the end of the string hanging out so the company commander could find it during inspection. He liked pulling on loose threads till your sleeve fell off. He walked backwards on the parade field until the thread ran out and said, "Wow! That's the longest string I ever saw on a uniform!" The whole company laughed at him.

Less than 3% of those who file get 100% . They have a microscope so far up our ass, you're just making shit worse

A particularly obnoxious co-worker was due to PCS from Korea to CONUS. As he departed our environs, an unknown individual made a "tip" call to a 1-800 number indicating he was a potential drug courier. We later received a phone call from the departing service member complaining he had been "exhaustively" searched on arrival in LA. Apparently he was carrying a joint, which made thigs much worse. Things got a little bit out of hand that time.

During BCT at Ft. Jackson, someone glued (with industrial adhesive) the DI's Smokey Bear hat to his desk. Man, was he p.o.ed about that. We suffered a week of extra P.T. for that one.

Called an Army O-6's (not a nice guy) office to tell him he was scheduled for his annual physical. When he reported for the appointment, the doctor was a proctologist.

When I was in boot camp we told this one guy that if he ate the scrambled eggs that they served for breakfast, he would go sterile. And he believed us!

Second best was getting the DFAC folks to bring out a high chair for our new height-challenged XO. He took it the right way -- after we all peed our pants

I was assigned to the front desk at Hickam's Base Photo Lab. The rest of the guys would often get their darkroom work done early and then played poker in the back room. They would play for a while and then some would go home early. Everyone was included except me, I had to man the front desk.... irritating.
One day a friend from our squadron's Life Support Equipment branch came by, and I was grumbling about it. You could hear them back there laughing and having a great time while I was anchored at the front desk.
I have a pretty powerful voice, and after a while, I went into our high-ceilinged, hard walled studio and called "PHOTO LAB ATTENTION!!!” The echo in there was tremendous.
There was quite a bit of noise in the back room as drawers and lockers opened and closed to clear the evidence off the tables and then silence. My friend was rolled up in a ball in the studio, laughing uncontrollably.
After about a minute of this silence, the door from the back room to the studio opened and my NCOIC's head poked around the corner. He walked with his hands behind him, "at ease" style only holding a cigar, and walked through the studio, the front office and into his office; looking for our Squadron Commander or the General officer that I had called the place to attention for. It was, of course, empty because anyone that we would have to do that for always had appointments and everyone would know that they were coming by.
My NCOIC returned and said "PARDEE" while shaking his head and returned to the back room. That was the last that I ever heard of it.