A couple of my memorable ones were killshooting myself on a squaddie in a 262, and another time I was rolling a 262, was about halfway down the runway and noticed a truck convoy coming across in front of me. I wondered, "Hmm... can you collide with th-... yup."
The one that was most surprising to me though was the time I was diving in a P51 and I thought I could haul on the stick as hard as I wanted, so I yanked back to maximum elevator really quick. I didn't think you could rip the wings off a pony up until then. Found out I was wrong.
Wiley.