I've seen employers describe their projects/startups and then they just wait for a reaction to gauge if it's something I would consider "fun", they seem surprised when I say I'm game for pretty much anything that solves someone's problem/has active users.

I even love taking care of the un-sexy tasks that nobody else really likes/there's a fight for, especially documentation -- I've written so many internal wiki pages I'm actually kinda sorry they're all locked up behind a login screen.

Any other task that sparks the brain, for whatever reason, is just a nice bonus.