Exploding Rabbit that's sweeping the nation at terrifying velocities: Super Mario Crossover.
The premise of the game is simple: It is the original Super Mario Bros., only your choice of playable characters isn't just limited to squat, Italian plumbers. You can also wreck Goombas while playing as Link, Mega Man, Samus, Simon Belmont or Bill (you know, from Contra). You could also just be Mario, but why would you do that, when you could be Bill from Contra? Stop being so silly.