Three drug dealers are just cruising around town...

... in their chevy, chilling out to a few good tunes. One is a cocaine dealer, the second one is a heroine dealer, and the third is a weed dealer.
Suddenly they come across a cop's car.
The cops go: "Fuck, look, the three dealers!"
The dealers go: "Fuck, look, the PO-LICE!!"
Tires screetch, sirens blast, before you know it a full on pursuit kicks off. The three dealer's car takes off in a cloud of smoke, slalom through heavy traffic at 160 mph, followed closely by a dozen of patrol cars.

As they approach downtown, the streets get narrower - they fishtail bullit-style around a corner, straight into a one way back alley. Blasting their way through rubbish bins, laundry lines and scared cats, they see in despair that the cops are still after them and have also made it into the alley.
But suddenly the brakes scream as the dealer's car comes to a halt, only inches away from a small brick wall built across the street. This alley is so tight there is no way of turning around: they are stuck.

The cocaine dealer goes: "Hey guys, no panic, I know how do get out of this. I have a pound of pure colombian in the back. I say we sniff it all, and we'll then be so fucking amped that we will RUN straight to that brick wall, break through it - and that's how we are going to escape."

The heroine dealer goes: "That's a fucking stupid idea. I say this: I have a pound of the best horse in the trunk. We smack it up fast, and we'll be so fucking high that we will FLY away - yeah, we are going to escape by fucking flying above that wall."

The weed dealer then says: "You guys are crazy. I've got a pound of nice skunky purple haze in the trunk. I say we smoke it all... and see what happens."