After many failed screen unlock attempts, the user is required to enter the Google account password. That's a good idea.
But what if I enabled Google's two-factor authentication, and then entered the wrong pin/pattern/password two many times? How do I unlock my phone now? How do I login to Google on another machine, when my phone is locked and I can't receive SMSs?
Is there anything very obvious I'm missing? Am I supposed to carry a printed version of Android's application-specific password in my wallet?