now ya see ... what you do is... sneak into his apartment and skrew off the shower head and put beef cubes (u can buy them at the store) in the shower head then skrew it back on... he will smell like chicken and noodles for weeks

or just find a day and see if he wants to go to home depot or someplace similar and tell him u need help finding something... tell him you forgot something in his car see if he'll give you the keys... go make a copy... later that evening when hes asleep move his car over a few parking spaces... the next night move it to the other side of the street... then again to a different spot... he'll think his car is possessed... dont forget to park his car at different angles to just incase he dosnt realise at first... after all the funs over you can do whatever you want to his car... such as... put a dead fish under the seat with the key jammed in its mouth
that one always freaks them out....... :-)