Entirely visual gag this, hence the use of caps (seems to be how people format this sort of thing).
1. EXT. DIMLY LIT STREET WITH A SOLITARY PHONE-BOX. A SHIFTY MAN APPROACHES, LOOKS AROUND AND ENTERS. HE LOOKS AT SOME OF THE PROSTITUTE CARDS STUCK TO THE WALL. HE SEES ONE HE LIKES, PUTS SOME MONEY IN AND DIALS THE NUMBER.
WE HEAR THE PHONE START TO RING AND THEN STRAIGHT AWAY WE HEAR HIS MOBILE RINGING IN HIS POCKET. HE LOOKS SHOCKED, PULLS HIS MOBILE FROM HIS POCKET AND HOLDS IT IN HIS TREMBLING HAND. HE STAGGERS OUT OF THE PHONE-BOX, HOLDS HIS HEAD AND SUDDENLY HIS VISION STARTS TO FADE TO BLACK.
2. EXT. DIMLY LIT STREET. CAMERA SHOWS THE MAN WITH A DEAD LOOK IN HIS EYE DRESSED AS A PROSTITUTE. THERE ARE A NUMBER OF SIMILARLY DRESSED MEN STANDING WITH HIM.