Fortunately nothing, I did lock the car doors though
Sitting reading the paper and listening to the radio in a nice little car park and suddenly became aware of someone in another car just watching me. Didn't think anything of it other than he was weird but harmless but after a while two more cars pulled in and three blokes in all went off together into the wilderness. Odd thing was 10 minutes later only 2 came back.
I wasn't that impressed as it is an area used by real dog walkers, often with their kids and I draw the line at that.
Months later and the same car park - and no I didn't go an a daily basis - some plonker had written a note and hung it on a bush. Just read 'I need sex today at 3:00'. I was almost tempted to hang around and see who turned up, female and possible bingo, bloke and I'd drive off.