Frequent making of jokes, including puns, can be a diagnosed disorder, possibly caused by a stroke.
A man had a stroke in 2004, seriously damaging his frontal lobes. He was left with very limited movement on the left side of his body. It also left him with ‘the inability to ever feel sad again‘.
Anosognosia is when someone has a stroke or another kind of brain injury, which leaves them with some disability (e.g. the inability to move their arm), and also leaves them incapable of believing they have that disability.
The crazy part? Squirting cold water into the left ear temporarily enables them to acknowledge the disability – for about 10 minutes.
Jean-Dominique Bauby suffered a massive stroke. When he woke up twenty days later, he found he was entirely speechless; he could only blink his left eyelid. Despite his condition, he wrote the book The Diving Bell and the Butterfly by blinking when the correct letter was reached by a person slowly reciting the alphabet over and over again. Bauby composed and edited the book entirely in his head, and dictated it one letter at a time. The book, about 140 pages long, took Bauby an estimated 200,000 blinks to complete. It was published in France on 6 March 1997. Bauby died suddenly from pneumonia three days after the French publication of his book.