The Monty Python pie sketch would be a good one, but would need three girls. I like the idea of having even more pie delivery methods - the pie sandwich, pie hat, self-pie, naive pie (handing one over to someone else to wipe the eyes, and then getting it delivered with interest), the trick pie (use one pie to threaten a pie in the face, and as the recipient ducks, sliding one underneath), and finishing with the pie barrage.
Then there could be one with buckets instead - the pour, the waterfall (drop it all out in one go), the throw, the double throw, the down-the-top, the dunk (bucket on head)...