Axl's Gender Bender episode, particularly when Zeb tries to seduce Girl Axl.
Olaf getting Dawn high off his chocolate chip dope cookies. There's something hilarious and oddly adorable about the normally straight-laced Dawn giggling and going on about clouds and climbing jungle gyms.
Olaf in a purple squid costume punching his son Johan. The flailing tentacles, blue underpants and angry stomping off don't help. Even Ty has to struggle not to laugh.
Olaf again when Bryn and Jacob end up at Mike's bar. He identifies them as the "midget giant" and "freakishly tall dwarf" by what they smell like...after circling around and sniffing at them. When he and the other gods introduce themselves, Bryn and Jacob run away. Jacob runs straight into the door.