Hermione : It's not going to work.
Fred : Oh yeah?
George : Why's that, Granger?
Hermione : You see this?
Hermione : This is an age line. Dumbledore drew it himself.
Fred : So?
Hermione : So a genius like Dumbledore couldn't possibly be fooled by a dodge as pathetically dim witted as an ageing potion.
Fred : Ah, but that's why it's so brilliant!
George : Because it's so pathetically dim witted.
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From: Harry Potter and the Goblet of Fire (2005)