Classicly

Pauker marvelled at the speed with which he moved down the row of booths. The sliding exit panel from one booth into another remained closed until the shot was completed, then flipped open, and you moved on, untouched by human hands. The shots were painless, a mere prickling sensation, and Pauker compared it to the brutal hypo-punching he had endured in his youth during military basic training.