Air rage
There have been a few cases where balloonists have been attacked on landing - sometimes assaulted by farmers, sometimes by the local populace (in the latter case usually with an eye to relieving the occupants of camcorders etc).
It never happened to me, but I did have one incident when I landed in a park and things got quite lively when it turned out that the "children" playing on the swings were, shall we say, older and more boisterous than I had anticipated. Fortunately the police turned up and the "youngsters" ran off and started chasing the police car ......
I had thought it would be OK because there were some old boys playing bowls on a green next to where I landed. Once I was on the ground I realised that the fence around the green wasn't chain-link it was razor wire!