Based on the same premise as a danger wank.
Stoner2: Yeah ok!
Stoner1: (on the phone) Hello police, I've got loads of weed lol!
Police: Holy shit! I'm coming to arrest you!
(30 mins later)
Police: I've received a report of possession of illegal drugs.
Stoner1: Er... no... there's no... drugs here.
Stoner2: Nope, none.
Police: There's no evidence. I've been bamboozled!