as a joke
for a joke BrE

She's always ready for a joke, no matter how serious the situation.

Later she learned that he had been stood up for a joke.

If she did, it would be no cause for a joke.

But it seemed like the wrong moment for a joke.

Mind you, she may have done it for a joke.

"How do you like that for a joke in a foreign language?"

I care much for jokes but not in the form of address.

On no account use It again, not even for a joke.

That sign over the door wasn't there for a joke.

Two boys were walking up to the sign for a joke.