I drive through there on the way to Minnesota a couple times a year. I try to stop and get gas and make everyone pee before we cross the Missouri/Minnesota lines to avoid stopping there, but sometimes we still have to.
It's a crap shoot on what sort of mumped up thing will occur, but something always happens.
High pressure Girl Scout cookie sales, people having sex in the gas station restroom, animals wandering up and licking cars getting gas, cars with like six American flags hanging off of them, people randomly walking up to you an describing their ailments, etc.