You can pick your friends. You can pick your nose. But you can't pick your friend's nose. Unless you're a rat:

> But there's still another level that I haven't sunk to yet, which is a lot of people let their rats clean their teeth and stuff, which is disgusting to me. But rats love to groom you because that is like hugging and kissing. I think that I got a lot of booger eaters right now. They just always want to get in my nose and try to clean my boogers, which is like, dude, stop. That is disgusting.

https://www.thisamericanlife.org/801/transcript