I'm not in the field (I'm corrections) but I do a lot of rides.
its fun to do the pass side when the dep is going driver.
When they reach for the box to get their info and i flip my light on the box its kinda fun to see the passengers head snap to the side...I had one guy almost shit it scared him so much!
Another thing that works if your alone and you get the bad feeling reach over and pop the pass door of your car wait a few then close it. Then get out of the driverside and it gives them time to see the reflection of the side door and NOT being able to see anyone! They alwayse ask "where is you other guy???
Some HP do it since they are alone all the time (make sure you do it at night... dont make your self look like a idiot)
sometimes BARK LIKE A DOG while your in your car! LOL
Thats alwayse fun to listen to in court on tape!