"Fred gave me one of those when I was seven -- it burnt a hole right through my tongue. I remember Mum walloping him with her broomstick."
-- Ron Weasley (PA10)

Acid Pops are a sweet sold at Honeydukes in Hogsmeade (PA10).
Acid Pops have the ability to burn a hole through the tongue of the eater, as Ron discovered when he was seven (PA10).
Acid Pops was also the password to Dumbledore's study for a time during Harry's sixth year (HBP9, HBP10).
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"Acid Pops" on the Harry Potter Wiki
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