this prank is pretty simple, with very destructive and stressful results. it ends with the toilet overflowing with an emulsion of carbon dioxide bubbles.
sorry for the slight lack of pictures. I don't have a legit camera, so I took most of them on my computer's webcam and one of them with my cell phone.
Step 1: ingredients
these ingredients are fairly simple. the only thing you could have a problem with is the citric acid, which you might be able to find on the internet. I found mine at an amish store.