This feels like a question better suited to Google Assistant or Alexa. I do find humour in almost everything and I laugh a lot, but unfortunately manage to actually tell jokes only by accident.

I was tempted to post The Longest Joke in the World here but as it's almost 11 000 words I ultimately decided against it.

I also tried googling for jokes but I didn't think any of them were funny. However, that wasn't what you asked for, so here goes:

When is a door not a door?
When it's ajar.