We’ve all seen them at the Halloween store. Tiny (or big) renditions of various spiders, snakes, rats, and other unsettling critters are all over the place this time of year. So, why not use them? Hiding one of these figures in an odd place such as by a toilet, in a cabinet, or on a desk could really give your roommate a good fright.
Source: https://www.distractify.com/p/halloween-pranks-for-roommates