Easy. In fact, it would be brilliant! Imagine: A bar that would fill up to, and then past 100%. As an excuse the team could just tell people "Oh we're just giving 110%. You know." I would be vastly entertained by the mass frustration and dark seething hatred amassed within the bleeding whimpering that does make up the 10 year olds that form our dark and decidedly repugnant Dragonball Z dependant community... yes... yes...
Or perhaps I am simply compelled by evil.