It might depend on the crime. Something small like a traffic violation or whatever, I'd just get bitched at. Anything more than that, I'd probably get an ear chewed right off. But, unless it was like someone in the family that I killed or something, I think they'd both support me in court or whatever, then disown me afterwards.
...if you announced that you were dropping out of your ivy-league college to become a play boy bunny?
Freak out and tell me about how Jesus would be ~soooo~ disappointed in me, and then they would probably call their pastor and have him 'lay hands on me and pray'. :P It's good motivation not to get pregnant.
Mom would: Wait for me to come back and sit on the porch, smoking a cigarette. She knows I'm not that far away. Dad would: He's probably part of the reason I ran in the first place. He wouldn't care. (Yeah, it's happened)
Dyed their hair Purple in the middle of the night?
I would be dead on a hundred different levels. ...Maybe not that extreme, but I'd definitely never be able to be alone with them ever again. Especially if it was my mum. Oh lord.
I already do and she just laughs at me. Or gets annoyed if she hears me talking and thinks its to her when in reality it's just me talking out loud to myself.