Ike Easter Egg
Before you brawl as Ike, select all items off except Smart Bomb. Go in brawl. When one drops down, stand next to it. Use Ike's Up Special (Aether) Up+B on it. The Bomb will explode with Ike's sword frozen then after that, Ike will continue to do Aether. He won't really flinch or launch, he just gets stuck at a jumping pose.
More tricks, tips and cheats for this game are right here - Super Smash Bros. Brawl cheats