just for fun or just for a laugh = not seriously, so as to have fun:

 ➤ We were playing cards just for fun. It wasn't a serious game.

 ➤ They said they were throwing stones just for a laugh, but it looked quite dangerous to me.

just like that = suddenly, without warning:

 ➤ When I asked him about Ruth, he walked out - just like that. (= I wasn't expecting it.)

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