Old comics, rusty tools, and weird porcelain cats. There are Victorian brooches next to Star Wars figurines. One seller might have a 1950s cocktail shaker, and the next is selling a slightly used garden gnome with a missing arm.
I once saw a dented trumpet next to a box of unopened Beanie Babies. The guy wanted £5 for the lot. That trumpet might be worth nothing—or everything. That’s the charm.