Oooh - this could be the best topic ever! Sadly, some of us are old enough to remember when Simon Mayo's confessions were on Radio 1... but that's another story. Can't wait to see where this goes.
I'll start with a 'mild' one: Got into Chessington World of Adventures without paying once. Stayed at one of the hotels, see, and the vast majority of their hotel packages include park entry, but I was a cheapskate and booked a room only package. Anyways, big queue of hotel guests at the hotel guest entrance, when it was opening time the dude just opened the gate and let everybody in, no turnstiles, no ticket scanners, nothing.
'Have a nice day' he said.
'I will now' I thought.
As a side note, we didn't pay for breakfast either. Boom!
Ooh ooh - just remembered another accidental free entry incident, Lightwater Valley. It was early afternoon on a quiet day, I was in the area so decided to swing in and grab a couple of creds. Had never been before, was on my own, didn't know where the ticket window was and the turnstiles were open because what few people were there that day were mostly leaving by this point, and there didn't seem to be any staff about. So I thought, f*** it. Just waltzed in, unchallenged. Boom!