Often there is a row of motorcycles parked at a bar (or restaurant, or any other building, but usually it's a seedy biker bar located on the edge of town). Naturally, someone's going to hit one, and it will fall and hit another, and that will fall and hit another and so on -- like the old Disaster Dominoes. That'll get a swarm of (stereotypical) bikers real angry and desiring revenge on the offender. Oh Crap. Used either for comedy or as a distraction. Examples of Motorcycle Dominoes include: