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Related to for fun: funny
In jest; humorously; not seriously. He teased her mercilessly, but though she found it hurtful, in his mind, it was all just for fun.
1. Also, in fun. As a joke, not seriously. For example, For fun the children told the teacher it was a holiday, or Their teasing was just in fun. [Mid-1800s]
2. for the fun of it; for kicks. For pleasure or excitement. For example, He played basketball for the fun of it, or They drove around for hours, just for kicks. Also see for the hell of it.