I have a recurring daydream that a cop asks permission to search my car and I say: “Fine, if I get to search yours.”
Or: “Okay, provided that you do so in the nude. Nothing to hide, right?”
Or: “If you’ll sign this contract accepting personal liability for any damage to my property, and agreeing to pay me $120/hour for my inconvenience. Oh, and I’ll just check your pockets for contraband first.”
Gotta wonder what would happen.
It would depend (a little) on the cop, and a lot on how many potential witnesses were standing around.