Had two frat brothers do that back in college. They were driving around and one of them held up a squirt gun, which looked like a real gun. Somebody reported it and gave a description of their vehicle. They pulled in into our house parking lot and a couple seconds later, here come three cop cars, blazing. The blocked the car in the parking space and did a felony stop on them. Ordered their hands out of the car and ordered them out one at a time and face down on the ground, guns drawn on them. The officers searched the car and found the squirt gun.
Needless to say, they got an earfull from the officers.