From the top of me head, Sing by Travis (a surprisingly not so terrible song), get Wrap Her Up by Elton John and George Michael 9Kiki Dee i believe gets a pie), Decayin With the Boys by Everytime I Die (a tribute to the earlier mentioned pie fight in Fight For Your Right to Party) and Katy Perry who pies herself in the song Smile. There's also a half decent pie fight in Charlies power ballad Its Inevitable. There's probs a fuckton more if I put my head to it but these are the immediate things leaping out.
Just remembered, taking the question literally, the Snapped Ankles song CIA Man just full on uses WAM vids (and other fetish stuff) in their music video. It pretty much features near every major producer at the time as well. I dont have a fuckin clue mind why they picked WAM of all things for a cover song of a Fugs "hit" but there u go.