Besides taking a shit on/in/around his pillow, here are some funny ones I found.
Sugar Shower
This is another fairly simple and innocent trick that is best pulled in shower rooms that are shared by a large group that includes the person (or people) you want to prank. All you need is a bag of hard candies that are clear. Then, you go into the shower and remove the showerhead, fill it with the candies, and replace the showerhead. The next time someone goes to take a nice, hot shower, they will leave coated in a sticky residue, which will only be discovered when they dry themselves. They will usually, unsuspecting of a prank, jump back in the shower to rinse off this residue, only to have it happen again. Filling a showerhead should last at least 3-4 times, making for a very frustrating shower for the victim.
You Said You Wanted a New Look…
…is one way to avoid responsibility after your roommate’s morning shower mysteriously turns his hair pink. Pour enough hair dye into the victim’s shampoo bottle and let him do the rest. This prank can be really funny if done to the right person: i.e. light blond hair dye for the counterculture, death-metal fan (it’ll match nice with his all-black wardrobe of Metallica and Slayer t-shirts), or jet black for someone who works at Abercrombie. Just don’t cross the line – making your roommate dye his hair green the day before a big job interview is a bit different than doing it the day before his presentation in Public Speaking class.
Pennying a Door
This is going to be one of the simplest tricks you’ll ever pull on somebody, but definitely one of the most fun. My dad actually told me about this when I asked him what they used to do for pranks in college; I can’t even begin to tell you how many times we did this to unsuspecting friends. To do the trick, get a buddy to sit with his back to you in the middle of a hallway, with your feet at the bottom of someone’s door. Push against each other so you have enough leverage to create a gap between the door and the metal frame. Once there is a gap, start sliding pennies into the space (either several with the face towards you or one with the edge towards you) and then let go. There should be enough stress on the door so that the person inside can’t open it to get out. To let them out, just push the door again and pull the pennies out.
Clock Shift
This is by far my favorite prank to pull on someone because not only is it incredibly simple, but it is very innocent, and the same person will likely fall for this more than once. The only thing you really need to do is locate a victim (preferably someone who never misses class with an early morning schedule) and wait until they fall asleep before you and your roommates. Then, set all of the clocks ahead by an hour or two (depending on the time of year and time of day because some switches are too noticeable) and let them get up and go to class hours before they need to be there. Once they have left the room, make sure to switch all of the clocks back to the correct time, so when they return home to yell at everyone, they won’t have an argument to make!