Collecting from deadbeat customers

I've done a lot of collections. My two best tools: an old cop car that I bought. Visit them Friday afternoon, a lot of folks didn't like to have the old unmarked cop car in the driveway. They would run out of the house and meet me in the driveway with money in hand just to have me leave quicker!
The second tool was my motorcycle. Show up on Saturday morning about 9:00 wearing mirror shades and a leather jacket. Get them out of bed and they didn't like that either!
C