ROFL
A few weeks before I was done with my active service I pulled one on the Captn.
Our MTB squadron had 3 boats, and every week the squadron commander from one of them came over for an inspection on the other two.
Our captn at the time was about to go through some evaluations to become a squadron commander. He was abit uptight and i knew he wanted thigs to be perfect. I knew our squad commander well and together we plotted against my captn.
While he was on the bridge waiting for the squad commander to get onboard, me and the XO blew up a "woman"

and placed her under the captns bunk with just abit of the hand sticking out and then we went up to our post.
After a while the squad commander with my captn behind him went into the captns cabin to inspect.. and guess what the squad commander found under the bunk and demanded an explenation for

Oh my... I have never seen him so red in the face, but he kept his cool. Oh my oh my... the squad commander and I sat on the conspiracy for a couple of hours and then let my captn off the hook, but those few hours were interesting indeed.
My captn got his revenge tho... The following weekend he put a picture of his girlfriend with some "kind" words written on the back in one of my pockets so the missus was sure to find it when I got home and she did my lawndry

She did find it and all hell broke loose and it lasted the entire weekend until she got a call from my captn.
Even today im not 100% sure she belives it was a prank played on me. I get to hear it from time to time.
Ahh.. those were the days.