Fabnesia
When you act like you're not a total creep who knows everything about your friend's life just so you can have something to say.
'You don't know they got a new tattoo? I guess I'll just say I got a new tattoo in my head.'
You didn't know your friend got a new pet? I guess I'll just say I got a new pet in my head.
You didn't know your friend got a new job? I guess I'll just say I got a new job in my head.