Ran a hairdryer all night, propped against my Mac laptop keyboard after a friend knocked over a full pint of beer onto it.

The next morning the whole bathroom reeked of stale beer, the power bill was astronomical, and the left quarter of the keyboard never worked again.

Took it in for repairs and was grateful AppleCare swapped it out without a peep. This was a while back, before the embedded moisture strips that void the warranty.