I would co-write a book with someone.
Because sometimes, I don't want to write epic fantasy. Sometimes I want to write YA, or horror, or mystery, or PG Romance for pity's sake. But whenever I try, my muse is like.. "What the heck are you doing? You're cheating on me! This is your fantasy world, your get-away, and now you want to leave me for some other... genre!?!?!" And I feel guilty, and stare blankly at the computer until tears of frustatration at my life are running down onto the broken keyboard. (seriously, I'm missing like 3 keys) Okay, not quite, but that muse can be so darn persuasive.
After reading this post at Lisa and Laura Write, I realized just how badly I want a sister/best friend to do crazy things with. I'm really more a 'tons of really good friends' kind of person than a 'one best friend' gal, but that's not because I don't want a best friend, I've just... never had one. At least not since sixth grade. I'm in France now (which is lovely,) and there are so many wonderful people here, but I'm leaving in a few months, so I'm sort of unwilling to really befriend people my age.
Wait, I lost my point. Oh yes!
I really think that, if it were a project with a friend, I'd be able to write in another genre. I could probably do it myself (and I'm trying!) but writing is such an important part of my life, I want to trust someone with it, share it with someone.
Sorry for my pity-party post! I'll be back in happy-land tomorrow. :D