Attempt the biggest combo by throwing your bob-omb onto the floor littered with 80 of the explosive things. If any bob-ombs get caught in the blast radius, they'll go off. Thus, increasing your combo.
However, bob-ombs move. Making it difficult to pull off a decent combo.
CPU's are on Master difficulty.
Recorded with Avermedia Extremecap U3 @1080p 60fps