/diy/ - Do It Yourself

None of this bunk is practical OP. Just get a fucking glass stink bomb (pic 'lated) and put it someplace where they'll smash it only a certain time. You don't want to put rotting bacterial things in your friends house.

In other words, put it under a rug in the coner of the room where your friends does his work-outs, tape it to the back of an open door so it smashes when someone closes the door, etc etc

It's fun for a couple reasons:
1. You'll be long gone by the time it happens
2. You'll never when it'll break, it's totally random and the anticipation will be delightful