Many years back when I was a teenager, a friend of mine had a car like that. One time we as thought he pulled up to us, one of my friends jokingly pulled out a bb gun but it turned out to be a real cop and he pulled out a real gun. Etc, etc...three or four cruisers ending up coming. The just confiscated the bb gun. h:

 

Get a pa system and siren. Then freak out your friends.

 

It already has a PA system in it, i just need to get a cb radio with a pa connection