Can't find this comedy movie about a sex scene in a moving police car
 

Hi,
This has been driving me nuts.
I once saw this movie, it must've been 15 years ago or something.
There is 1 scene that I remember… I'll try my best to describe it…
So, it's a comedy movie, I think it could've been a Police Academy rip off, not sure.

What I remember of the scene is the following:
A couple gets freaky in a parked Police Car, they accidentally put the car in drive, the car starts rolling to the street without them knowing… The car eventually stops on the street next to a pavement with criminals. The criminals hear the couple through the car's megaphone, the criminals think they are being held up by the police, they give them strange orders, one that I remember was that the criminals had to pull there pants off. (The woman in the car says that to the guy in the car)

The couple themselves could be in police training, I don't know…
This has been driving me insane. I'm hoping someone can help me…
Thanks for your time!