Bumping

Ok, so I'm coming out of the parking lot after watching a movie and a Tahoe rolls behind and he's bumping with his windows down. So I figure I might as well see who has a louder system. So then I pop in some shit from Lil Jon & the Eastside Boyz Part II, roll the windows down, increase the bass, and within seconds I see the other guy rolls his windows up and stops bumping. Does this mean I win? Just wondering what you guys think.