Everything on your resume is fair game. That’s part of the reason why padding your resume with useless junk doesn’t work. Maybe it’ll impress. In actuality, you’ll just embarrass yourself when you can’t talk about it. Is there a balance?
No. Every line of your resume should invite conversation. While you shouldn’t create elaborate stories in your head on how each line should go, just remember that if something catches their eye, they’ll be curious. Better that they’re curious about something that actually happened that you can talk about than something you made up or grabbed from a resume site.