i got a few,
if your friend is a guy and uses a dry rub deodorant then you can take the top part off with a knife and then cut a bunch of cream cheese off and then put it on top and then skillfully craft it into what appears to be his used deodorant stick. if its not obvious, when he uses it, he’ll get some cheese pit action.
if you empty his can of spray deodorant, then you can get some spray paint and then the inner tube of a pen or mechanical pencil. you take off the useful spray nozzles of both and then wedge the tube on the empty deodorant can and then put the paint above it and press down HARD, so each nozzle depresses. the paint will go into his deodorant can and then he’ll paint himself.
you can also buy clear jello mix and then put it in the bog of his toilet. that way it gives him something to clean out when he finally realizes that nothings going to go down.
If you have some, you can put some sodium iodide in the bog of his toilet and some hydrogen peroxide in the top, so when he flushes, he’ll make a whole bunch of elephant toothpaste. remember dont be stingy with what you got!
if you take the little hose in the top of his toilet, and then pull it out of its regular spot and then put it facing the direction of the person “doing their business” with the lid on top of the open end of the hose with hopes he doesn’t see it. when he flushes, water will get all over him.
you can get some lycopodium powder and sprinkle some on a light of his, when he turns his light on, it’ll explode(you might want to find a light with no coverings)