In Dragon Ball Z Abridged, the training that Tien, Yamcha, Krillin, and Choutsu go through while waiting for Vegeta and Nappa to arrive to Earth. Tien says it was terrible when he brings them back and Krillin, when Gohan asks about it, begins crying. During this time Popo teaches them the pecking order "You, the dirt, the worms in the dirt, Popo's Stool, Kami, then Popo."
*at Guardian tower for Popo's Training*
Popo: Any Questions?
Krillin: Um, yeah, I'm-
*bitch smack sound*
Krillin falling: AHHHH!!!!
Popo: Have a nice climb back up, BITCH!