A stupid party game/trick I used to try to get people to play as a way of showing off some specialized knowledge I thought I had: Let’s name rivers! Specifically, let’s name X rivers in Y, where X is an uncomfortably high number and Y is a place I happen to know pretty well.
For instance: Name 25 rivers in Illinois (rivers bordering Illinois count). It’s been a long time, but: Chicago, Fox, Rock, Pecatonica, Apple, Mississippi, Illinois, Mackinaw, Big Muddy, Sangamon, Spoon, Vermilion, Kickapoo, Kankakee, Des Plaines, Wabash, Galena … and from here, with 17, I need help: the Ohio (a no-brainer), Kaskaskia (thought about this one, but wasn ‘t sure), Iroquois (same name as the county south of Kankakee County; forgot about it). That’s only 20. That means I have to look up rivers I may or may not ever have known existed: the Kishwaukee, the Green, the Saline, the La Moine, the Macoupin, the Cache. (For the really curious, here’s a map: Major Watersheds of Illinois.)
See what fun that is? The whole family can play!
If you don’t like rivers or Illinois, try counties in California. Or lost pets in Wichita. Whatever you know.