Upon further thought...

The fact that my car has been hit is apparent. The question of how or with what still remains a mystery. Here's a current list of theories:

1. When I first walked out, it looked like someone had hit my car with another car. There was a pretty bad dent in there. This one is highly unlikely, because the size of the dent and the location of the dent do not flow with the possibility that it got hit by another car, or even a bigger truck. The dent is too high for any regular car to hit it, plus a car or a truck's bumper would not fit in the spot that it is in without causing some surrounding damage.

2. Upon second thought, people were mad that I brought my car back to the apartments. They probably beat it with a baseball bat. This theory is feasible, because the dent size and location fit the baseball bat idea, as long as it's a midget swinging the bat. Put a three-foot tall human there with a baseball bat, and yeah, he could swing it like a regular person would and hit my car about two feet about the ground, inflicting a blow parallel to the ground.

Who would swing the bat?
2a. The loser(s) who stole my stereo.
2b. Punk kids with nothing better to do.
2c. The tow truck guy (because he jolly well may carry a bat for protection) who swing though the parking lot every morning, checking for cars that are not supposed to be there.

3. Upon tossing around the idea with Ken, we thought that maybe it was a towtruck. Those things usually have pretty solid bumpers, and they almost always have a grate or some sort of pusher on the front of the truck. These are usually made out of a piece of metal about the size of a bat wide, and considering it's attached to the front bumper of the truck, that would also place it sufficiently high about the ground.

4. Eric suggested a hockey stick. Could very well be. It's positioned correctly, and those are used to hit a puck pretty hard -- they could easily inflict damage to my car.

5. Misthrown baseball. Perfect shot.

6. Ken getting jealous of my stereo and taking it out on my car.

7. Demons.

8. Me sleepwalking.

9. Me sleep-driving.

10. Me existing.

Those are the running theories. So far, #3 seems to be the winner. I'm still working on collecting evidence. Basically, this means that I need to ask the apartments if any vehicle got towed that night, and if so, where.