I once "escaped" Frankfurt *by accident*; I actually entered Germany without meaning to there was an unlabelled fork in the road and a tiny border checkpoint in the corridor which I didn't correctly recognize.

I thought it was some random airport checkpoint (it was really small, fitting in a corridor) and gave them my passport which they stamped. Five minutes later, I'm outside.

I go back through security and they're like "you entered Germany just a couple hours ago (it was early morning) wtf were you here for" and I made my best sheepish face and said "oh it was an accident"

See also:

See also:

My favorite FRA incident was when the guy at security forbade me from taking items out of my bag that I knew would need to be X-Rayed separately, only to have the X-Ray guy fail the bag and run it through again with those items separated.