Someone slashed the tires and knifed the top of Vogon's car. They also opened the gas cap, which suggests something was added to the tank.
We can't think of anyone that would have any problem with us other than the downstairs neighbors, who I called the police about once at 0330 on a Sunday morning in November to ask them to turn their music down. (They play music at floor-shaking levels at all hours, especially 2200-0000 and 0300-sometime after dawn on weekends.) They threw a very loud party last night that another neighbor may have called the police about, but I was asleep through most of it because my sleep schedule's off and I was dead tired.
He's talked to the police twice -- first they said they'd call back, then he called again after seeing that there's snow in the weather forecast and with the car at the end of a carport, we worry evidence will be damaged by it. I'm hoping they send someone out to take fingerprints off the car before the bad weather moves in and that whatever was done to the gas tank is on the less expensive end of the price range to repair.
ETA 2030: The police finally called back... but Vogon was asleep and he's hard to wake, so the woman on the other end told me he can call back anytime. Somehow I doubt anyone's going to come out to see the car before Christmas. I'll go take pictures in the morning so at least they'll have that.