Teenagers: How many are there?

In reality, there is only one teenager in the world. He drives a white, 1.3 Vauxhall Nova with alloy wheels, sports exhaust (both of which cost more than the car), red padding round the seatbelt, blue LEDs where the washer jets should be and the drivers seat set so far back and down that all you can see of The Teenager is the peak of his beige Nike baseball cap. He wears a tracksuit, Nike trainers (which also cost more than the Vauxhall Nova), a grade Two haircut (moussed / gelled / clayed / whatever!) and, I'm told, would smoke Marlboro Lights if they could afford them.

The multiple teenager effect is done with mirrors.