He starts screaming and pulls back a bloody stump. (j/k)
Mephisto: AACK!
Kathy: What? What's wrong?
Mephisto: It TICKLES!
Trey: Dumbass. *smacks Mephisto*
Mephisto: Ow! Okay, I'll go. Don't wait up.
Barry: Just go, fer crissakes!
Mephisto: All right, all right...
*Slowly, dramatically, Mephisto walks into the portal.*