Okay, my pee can trick! On a wet day when everyone has rain gear on, make all the movements that suggest its time to get rid of the morning coffee. Take the bucket and dip it in the river like your washing it out before you do your business, but fill it half full of water and bring it back into the boat. Go through the motions,(usually no one watches too closely) turn around, trip and dump the bucket on your buddy, immediately apoligize profusely. The reactions are usually priceless and make you laugh until it hurts.