Mine is an excerpt from How to Get a Boyfriend which is a silly Miranda Sings song. (And would only make sense to listen to if you know who she is.) It's been like that for years though so I need to get a new one soon, but I don't know what, haha.

My mum's ringtone for us (her kids) is an excerpt from a Japanese song from an episode of Teen Titans called K2G (starting at 0:40). XD (I miss that show so much.)

What's yours?!