Last week a guy pulled in front of me while I was near my work?

Let it go. However, always be aware of your surroundings and everyone around. The best offense is a great defense! If you find yourself being followed, drive to a well lit, very public place like the police station, fire department etc.. stay in your car and lay on the horn. Someone will use there cell phone. They will be spooked off. Try to get at least the model of vehicle and part of a license plate number.