Looking for a good pratical joke to play on my BFF?

wrap a rubber band around that spray hose on your sink so that it holds the trigger down to spray water through it - put it back in place pointing it toward where a person would be standing when they go to the sink to use the faucet then ask your friend if she/he would kindly get you a glass of water - When they turn the tap on the water will spray out onto them not only getting them wet but shocking them as well.