”All his behaviour seems to us a game. He applies himself to linking his movements as if they were mechanisms, the one regulating the other; his gestures and even his voice seem to be mechanisms; he gives himself the quickness and pitiless rapidity of things. He is playing, he is amusing himself. But what is he playing? We need not watch long before we can explain it: he is playing at being a waiter in a cafe.”

Being and Nothingness, Jean-Paul Sartre (1943)

Bad Faith (wikipedia.org)