My favorite Youtube Poop is "Caillou tlt uolliac", because I thought it was very funny! I liked the part where Caillou says "Come on! I, have, lots of times! I'll show you how! Come on! I, have, lots of times! I'll show you how! Lots of times times times!"
Note: That Youtube Poop has cursing in it, and I would not recommend that video for anyone under 12 who likes Caillou.
Link: https://www.youtube.com/watch?v=ii9ylioeZrA