I just did it for a laugh, but it got out of hand.

我只是开开玩笑，然而却一发不可收拾。

《牛津词典》

The important thing, just take some time out to laugh and flash that beautiful smile, even if it's only for yourself.

重要的是，要腾出时间来欢笑，传递美丽的笑容，即使只为你自己。

youdao

That it could have runaway metaphors just for a laugh.

它不苛求优雅的文字，甚至会用上一些失控的隐喻只为博人一笑。

youdao

When arrested, he told police he sent the message on 10 July last year "just for a laugh".

BBC: EDL bomb hoax message jury fails to reach verdict

Just for a laugh.

BBC: Bristol

Laughter Yoga is offered in classes for a price, but most people just get together and laugh for free in weekly meetings.

FORBES: Break Stuff And Laugh Your A*s Off