Wario's crazy antics are funny. Also, when my Brother is playing Pikachu, sometimes he has it walk slow and just does the F-tilt. And when I'm being extra faily, it keeps hitting me, and it seems to have strange range and priority against Jiggs. =P
King D3 when I'm using him, and do Up-B, and I forget it can't grab the edge on the way down, and I come down and fly passed the ledge.
Also when I'm using Diddy, and I get two banana peels out, and I keep hitting my opponent aaaaaaaaaaaaalllllllllll the way across the room (Stage) to the other side.