#1: poop
You don't have to share your peanut butter and then see it wasted all over the floor.
You don't have to deal with ANY OF THIS.
Via marginalizingmorons.blogspot.com
Or this. NOPE.
Via imgur.com
You can decide whether or not you want to decorate the walls.
Via rantaboutthisandraveaboutthat.blogspot.com