Quote from Kelso in On with the Show
Angie: Hey, Eric, can I have some of your fries? Eric: Sure. Angie: Well, I don't want any. Burn! [laughs] Hyde: I think you're confusing a burn with just talking. Kelso: Eric, can I have some fries? Eric: Yeah, help yourself. [Kelso leans over and digs his face into the tray of fries] Kelso: [mouth full] Burn! Eric: Yeah, I knew you were gonna do that, so I spit in them. Burn! Totally. Angie: Hey, hey, hey, hey. You ate his spit. Burn! Kelso: That- That's a piggyback burn. We don't do that.