In the following steps I will explain how to put together a water-based obstacle that will annoy anyone and everyone and add a few tips for making it really evil.
Step 1: Materials: cups and water
Step 2: The prank
Step 3: Tips
Friends are helpful and so is a nearby sink. An assembly line makes this move much faster.
Watch out for doors that open into your prank space and anything else that could knock over the cups. The goal isn't for your prankee to open their bedroom door and take out two feet of cups. You'd rather they to try to walk through the cups and THEN knock them over. Or knock them over while cleaning them up.