Hermione: "This is Felix Felicis, I suppose? You haven't got another little bottle of — I don't know —"
Ron: "Essence of Insanity?"
Harry: "Trust me, I know what I'm doing... or at least Felix does."
Ron and Hermione become suspicious after Harry takes Felix Felicis and says he's going to see Hagrid[src]
Essence of Insanity is a potion which causes irrational decision making. Ron Weasley sarcastically offered Harry Potter this after consuming Felix Felicis on 21 April, 1997.[1]

Behind the scenes

  • It is unknown if Ron was referring to an actual potion, or was merely speaking metaphorically.


Notes and references

  1. Harry Potter and the Half-Blood Prince, Chapter 22 (After the Burial)
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