Some people in life are natural joke-tellers. Others (like me) love a good joke but are pretty hopeless when it comes to delivering them.
But whether you're a dab hand with witty repertoire or not, I'm sure you enjoy a good laugh.
They say that laughter is the best medicine, and whilst I wouldn't recommend relying solely on watching episodes of The Simpsons if you contract malaria, there's no doubting that laughing does you good. It usually makes you feel good too.
Helpfully nature has given us the ability to laugh when we see or hear something funny, even if our mood is otherwise low.
This can come in very handy when you're in a rocky state and don't feel like doing all the other things you know might do you good (get exercise, socialise etc).
Books of cartoons have worked for me in the past. As have videos of favourite funny films and TV shows.
You won't feel like getting them when your need is greatest so keep some supplies handy.
I'm not joking. (Sorry, you knew that was coming.)