A little creepy

So I was leaving work tonight and as I walked out the door to go to my truck I saw a car parked on the other side of my truck. I could see someone's boots underneath my truck and as soon as I came out of the building that person quickly turned around and got in their car and sped off. When I first walked out the door the boots were facing my truck is if the person was looking at it or something. All I could see for sure was that it was a small red car. They pulled away so fast when I walked out. Sometimes guys at work will play tricks on me but that's always been inside work, they have never messed with my vehicle or done anything outside before. I walked around my truck a few times to see if I could notice anything strange. But everything seemed normal. Not sure what to think about it but I'm a little creeped out...