You know you're a nerd when
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You hum and whistle what you think is a classical tune for months. Only to finally place it, and realise it’s the Joker’s waltz from the 80’s Batman flick.1

He's almost as creepy as the newest one by by Fox Magrathea Circe
Actually, I knew it was from the movie but thought it must have been a classical piece first ↩