Sorry, I should have said recovery scam, I guess. They come up and ask if you can help them get access to their google account because they got locked out and [insert excuse why they cant get the code]. They ask you to put in your email so a recovery code for their account goes to you and would you please give them the code so they can get into their account. But its actually your account.

I'm actually not 100% sure how this works, but it's like the Steam access code scam.

Since most people use the same email for everything, they can gain access to services through password resets after they lock you out of your own account.