Funny you brought up the fuel cap issue.
I was at I69 (Clermont County-Sporty’s Pilot Shop) getting my son a new knee board last weekend. A guy flew in with his mom in a 152. He checked the fuel upon landing but left the caps off-with the caps on top of the wings.
After shopping, they went back to the AC and preflighted, but the caps were never replaced. I was upstairs and ran down once they fired it up and flagged them down to put on the caps. I don’t think the guy realized how quickly the negative pressure will suck the fuel out.
And you almost never make that mistake in a Cherokee or a 310 or...pretty much any low wing airplane.
Funny that.