Well my parents are not responsible for me now, but If they found I have did something really wrong like maybe do drugs or something, they would shake their heads and demand that I get help and put me out the house.
My dad would forever tell everyone that it blew up because I put marshmallows in there, even though I have never once done that so I don't know why he insists that's all I do with marshmallows when I buy them.
If you made a video of them doing something mortifying, uploaded it online and it went viral?
Probably not even notice. Well, my mother wouldn't because I try to avoid communication with her anyway. My dad might send me a message that he hasn't heard from me in a while if he isn't too busy.
If you converted their house into a bed and breakfast while they were away on holiday?