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You got Facebook Alzheimer's if you can't remember someone who's trying to friend you, but they remember you from back in the day. They probably have mutual friends to prove you know them, but you're too lazy to look them up in the yearbook.
'Hey, do I know you?' 'No, but you know me, right?' 'Wait, are you from my 8th grade class?' 'No, I'm from your 8th grade class!'
'You're my old boss? I thought you were my old boss's brother.' 'No, I'm your old boss.' 'Wait, I worked with you, didn't I?' 'You worked with me. You had the same coffee addiction.'
'Do I know you?' 'Do I know you?' 'I don't know you, but I know I know you.'