I crack myself up - A loud claim from someone who thinks their jokes are legenda

A loud claim from someone who thinks their jokes are legendary, even if they sound like a broken kazoo.

I crack myself up every time I mess up a joke. It's like watching a train crash.

My friend said I crack myself up. I said, 'You're just a bad listener.'

I told a joke so bad, I crack myself up just thinking about it.