We might typically associate philosophers with wisdom, knowledge and tranquillity, but that doesn’t mean they can’t go off the rails and act a little crazy now and again. Then again, what is crazy, right? I guess these philosophers would have been asking themselves the same question.

Here are 9 occasions which may suggest the following famous philosophers had lost their marbles:

9. Descartes Slept In An Oven

“I think therefore I am” is the quote which Descartes is best known by, but did he think of it while sleeping inside an oven? Well, not technically an oven — it was more a stone room where a fire was always burning.

It definitely wasn’t designed for people to hang out inside of, but Descartes happily slept in one and had dreams/hallucinations that helped develop his philosophical beliefs.

8. A Chicken Is Not A Man

Greek philosopher Diogenes disagreed with Plato’s description of a man as “a featherless biped”, so much so that he hand-plucked a chicken and then delivered it to Plato to argue that a chicken is indeed not a man.

Bit extreme, but a point well made perhaps?

Plato added “with broad flat nails” to his definition.