I made this in less than ten minutes--so worth it for my husband's reaction: "Aaaaa! Why is there poop on the toilet?!" For a moment, he thought our dog did it. (But how did she balance herself on the toilet seat?) Then he thought our fifteen-year-old was in such a hurry that she didn't notice she left poop on the toilet. (Wha?)
OK, now go forth and prank someone.