This is the episode where Joseph is trying to decide to hang around with the "cool crowd", a group of troublemakers . In this episode, Hank, Dale, and Bobby are tyring to make Joseph have a spiritual vision on John Redcorn's advice . Dale ends up having the spiritual vision instead . He sees a Native American man wearing a massive Indian headdress making love to Nancy, and then Nancy having Joseph, who is wearing the same headdress . He immediately comes to the conclusion that it means Joseph has to go with the episode's "cool crowd" and kill a panda . Does anybody remember this episode ? Can anybody give me its name ?

Sounds like "Vision Quest" http://www.tv.com/shows/king-of-the-hill/vision-quest-188610/