Sailing Pranks

Sorry if this is a copy of some one elses thread but I couldnt be bothered lookin further than the first couple threads.
What is the best ever prank you've done thats sailing related?
e.g. puttin summit like meat or cheese in sum1s air tanks so it rly smells when they open it next (tho of course it wldnt work to well if the air tank was completely air tight but its the idea that counts)
or attching broken shackes sumwhere so wen a string is pulled it falls into the boat making the person really nervous and paranoid

removing the pin from a laser rudder stock so when the tiller is pulled forward it will fall off, nearly always resulting in a capsize.  

Just leave a spring clip in the bottom of someones boat and watch them take there rig down to make sure its not come off up top and then watch them check over the whole boat and eventualy and very gingerly go out saling hoping that they wont have something break on the way past.

"Just leave a spring clip in the bottom of someones boat and watch them take there rig down to make sure its not come off up top and then watch them check over the whole boat and eventualy and very gingerly go out saling hoping that they wont have something break on the way past"

A lone shackle pin can have the same effect. This one backfired on me as I have a chain of spare shackles attache to my toe-straps. One came off and I had to stop mid-race, convinced I was about to be demasted.

Taking a well known fleet members boat and mooring it on the water at Grafham on Saturday night is ammusing too, allegedly. Before my time!!!