The other night a driver had a problem finding mrsmicah. She called him to say she was standing outside at the address she had given him, but for whatever reason he had trouble getting to the address (it's a slightly confusing area, but still...). After a few minutes he canceled the ride, charging her. Probably not coincidentally, when she went to request a new car, there was a Surge in effect.
An e-mail or two to customer service got the cancellation fee refunded. Not sure if she's been able to get the surge surcharge removed from the rebooked ride.