When going at a theme park bring a bunch of random bolts and screws, just keep them on you. When you are in a long line put your hands in your pockets and leave them there for a bit, then at some point, perhaps when the roller coaster car zooms by make one of the bolts fall out and land on the floor, then pick it up and just look at it, while looking at the roller coaster itself. The line will get shorter.