Giant, pallid and fleshy, the faces of actors Jonah Hill and Channing Tatum are plastered all over Los Angeles. On billboards, buildings and buses, their mirrored-sunglasses-wearing selves seem to be promoting their new movie, 22 Jump Street, everywhere.

Each time the film’s directors, Phil Lord and Christopher Miller, see the ads, their reaction is the same: they can’t get their heads around the fact that the signs are even there.