I have some ideas; how about the characters go dogpile sleeding; where one character lies on a sled down hill while others try jumping onto the character on the sled? ANd how about Wario hit a spring and flying into a huge wall; breaking it with Knuckles running like Indina Jones? Or one crew member each dive from a diving board into a pool with no water; but springs from Sonic the Hedgehog that launch them in the and land in the pool onto flat concrete; but no springs.
McKickass
maybe you can use some of the sports that mario has whored his image out to like soccer baseball tennis golf and the olympic games and just do constant random nut shots like the actual jackass does