But you don't need to prove to all others that you are yourself, do you? You are only asked whether you're 18, the bouncer doesn't care about your name. So you

But you don't need to prove to all others that you are yourself, do you? You are only asked whether you're 18, the bouncer doesn't care about your name. So you can still hold the phone (like last summer the ID) of someone else and fake their answer.