This one works pretty good from experience, You need to get 15+ people to go to the store with you. You and a friend need to go to the bike part of the store and have everyone else in lanes around you guys, and ask an employee(ours lets us ride it) to ride a bike go up and down the lane. Then have one of your friends at the end of the lane give you a dirty look, drop the bike pull out toy light-saber(s) and scream something funny, then have a huge battle in the store.
might also help if you follow shoppers around saying you'll protect them and what not.