I bet that was one of the most awful feelings ever when you realized what you just did.Yucky! Glad it didn't turn out too bad.
Been there before, actually. We had my brother's mountain bike on our roof, actually doing him a favor keeping it in our garage for him for a while ... and hubby wanted to try out mountain biking, so it was supposedly great for both parties. Hubby said, "Don't let me pull into the garage with the bike on the roof." An hour later, we're pulling into the garage. Oops! That was like 5 or 6 years ago and there's still a mark in the stucco above the garage. It was fixed, but the color doesn't match and I notice it ALL the time.
I don't even remember how bad the damage to the bike was. It wasn't a super expensive one and my brother doesn't even ride much, so yay for that. On the positive side, hubby DID get way into mountain biking and races (in addition to the road biking he was already doing). Now if he ever pulled into the garage with HIS "not cheap" mountain bike? Bad news!