The Tinted Toilet Trick
Mischief maker Copperstar Coyote wrote in with this fun twist on the ol' food-coloring-in-the-toilet prank:
"My prank is based on your 'Eerie Foaming Toilet' prank, but it is much less labor intensive. Lift the lid of your toilet tank and put red food coloring in the water. The next time someone flushes, it will look like the toilet is flushing BLOOD. For a St. Patrick's Day alternative, use green food dye instead."
We'll also point out that red and green are cheerful Christmas colors, so if anyone gets angry with you for coloring the toilet water, you can always tell them you were just trying to be festive.