Love this. What are they laughing about? We don’t know. But there’s also this:
I read somewhere that Sartre loved to sing “Old Man River” and often did so at the top of his lungs. A friend of mine used to do an impression of this (baritone voice, passionate feeling, crazy French accent, some existentialist twists) that never failed to make me laugh.
It is an unconfirmed rumor that this is the source of the mirth in these photos.