When I was a teenager, I went down to Socorro, New Mexico to spend some time with my cousin John (John-o). On Saturday morning, we got up, with massive hangovers (as usual) and started making breakfast. John's little brother, James, was sitting on the couch being his incredibly obnoxious self, screwing with us to no end. I got tired of it and went over to John, who was just finishing up the breakfast sausages. I took one of the sausages, got a paring knife and proceeded to hollow it out. I then went to the cat box, got a nice fresh turd and stuffed it into the hot sausage. When I was done, I plugged the end with some of the meat I'd taken out, put it on James's plate, along with a nice pile of eggs and hash browns.
It took James a couple minutes to take a bite of the special sausage. Up until that glorious moment, John and I kept our noses in our dishes so he couldn't see us laughing. James was continuing to antagonize us and obviously thoroughly enjoying being a pain in our ass. Just before the "big bite", we watched James cut a slice off the sausage that just nicked the feline poop and eat it. There was only a smear on this bite but it was enough for James to say "something smells like shit". Then it happened, he speared the entire sausage with his fork. While raising it to his mouth, we could see the warm fecal material squeezing out of the end of the sausage like cheese from a burrito. It only took one good chew for James to realize something was terribly wrong. I'm sure it was a combination of foreign taste, horrific odor traveling from his mouth to his nasal cavity, the crunch of cat litter and John and I on the floor howling with laughter. I'll never forget the confused and horrified look on James face as he looked at us with a grimacing smile that showed what could have been mistaken as "chocolate pudding" in between his teeth and on the corners of his mouth. Needless to say... James never fucked with me again.