What part should I play?

Today, on line at Starbucks this thirty something man right in front of me was carrying a huge balloon.  It was floating right at the level of my head and as the guy was turning around, the balloon was knocking my head. What mask should I have put?  Was I supposed to be amused? or was I supposed to sternly ask this guy to watch  his parafenalia? Decided to cast a cold eye and order my grande....dark.