What is the best/worst you've done when selling at a swap meet?

I have a Mopar bud in Al. He had a bud that owned an old boneyard and he would let my friend go out and take off bolts, screws, the little things for free. My bud would drive to Carlisle and sell these "trinkets" for $1 ea. He had many many little plastic boxes with 3 x 3 holds for each and all labeled. By the end of the day, he had a 5 gal. bucket full of $1 bills but probably not $300 total! for the 3 days! but he loved the trip and selling that stuff. Jimmy Smith. Alabama.