One of them pretends to be a terrorist. He gets a beard made of pubes, he doesn't know.
He gets a taxi, with a taxi driver again unknown to him, in on the gag. He's talking about going to the airport and when he sees a plane he says "Boom, very good!".
Taxi driver puts the foot down, drives somewhere quiet, beats on him and pulls out a gun. Forces him in the trunk of the car. Bam runs over, pretends to argue with the guy and then they pretend to get Bam shot. Taxi driver drives around for a bit.
Guy in the trunk is crying. Taxi stops, trunk opens, everyone laughs... Guy finds out he had a pube beard.
Golden.