I dropped an open and filled water canteen/thing from a table directly onto my MacBook Pro that was on the floor (I was like a minute away from starting a yoga video). It was soaked. It shut itself off. I placed the MBPro on the ground next to a window in a sunny and bright spot to let it dry, open and face down with the keyboard and screen facing the floor. I was away from home and didn't have a screwdriver to take the battery out.
I just left it there over that weekend while I researched getting a MacBook Air as a replacement. After fighting the urge to mess with it after a few days, I turned it on and it's worked perfectly fine all of these ~6months after that happened.
(and yes, I can acknowledge how stupidly lucky I was and this probably isn't the norm, based on so many internet comments I read that weekend from people who experienced similar situations.)
Also -- I now have a MBAir anyway, and if I could be guaranteed that no harm would come from it, I'd totally put it in the freezer just for bored fun.