The thing is, I'd forgotten about one of them, but when I rediscovered it I couldn't stop laughing for a good five minutes. It's the story where Calvin's dad is trying to take a picture of Calvin, for their Christmas letter, only to have Calvin ruin every single picture with the faces he pulls. The very first one of those is my number two favorite, where Calvin pulls his face, and the last panel has him running away from his dad.
My number one favorite is the mostly silent strip where Calvin's mom puts on her nice clothes to go out, only for Calvin to be waiting for her at the door. The grin on Calvin's face cracks me up every single time.