Season One, Episode 7. Doyle's ex-wife is engaged to an Ano Movic demon who invites Doyle to his Bachelor party as Guest of Honor. Doyle begs Angel to come along for moral support and it's a good thing that he did!
Season Four, Episode 6. Not unlike BUFFY'S "Tabula Rasa" in which Willow tried to set everything to rights with a spell that erased everyone's memory. Here Lorne tries to restore Cordy's memory but the spell backfires and everyone's memory is erased. Not as funny as it should have been, or as "Tabula Rasa" was, but an A for effort.