Funniest parts in my opionain were:
When Reepicheep and Caspain meet in the fern forest.
All the parts with Edmund and that stupid flashlight.
When the Mice tied the Cat up during the Castle Raid.
When Edmund went with the Duel Propsel to Miraz when he says "Its King actually. Just King though, Peter's the High King. I know its confusing." That always cracks me up!
Lucy at the End of Berunas Bridge dagger in hand Aslan at her side facing the Telmerine army! Best sence in the movie! I'm always giddy when it gets to that scene.
And when Lucy says "You might need to call me again?!?" and Susan says "Oh shut up!" jokingly I dunno why but that I think is just so funny!
After Su and Caspian kiss, Lucy: "I'm sure when I'm older I'll understand." Ed: "When I'm older I don't think I want to understand." Those lines saved that part of the movie. Note if I got Edmunds line wrong its because the speak in british acents and it sometimes gets hard to understand.
That movie was funnier than the first (one of its only redeeming qualitys).