Oh, it can't be a reference to the fact Harry's a great Seeker, that's way too obvious. There must be a secret message from Dumbledore hidden in the icing!
J. K. RowlingAnd sure enough, in seeking to become superhuman this foolhardy young man renders himself inhuman. The heart that he has locked away slowly shrivels and grows hair, symbolising his own descent to beasthood.
J. K. RowlingThe knowledge that you have emerged wiser and stronger from setbacks means that you are, ever after, secure in your ability to survive.
J. K. RowlingHow're we getting to King's Cross tomorrow, Dad?" asked Fred as they dug into a sumptuous pudding. "The Ministry's providing a couple of cars," said Mr. Weasley. Everyone looked up at him. "Why?" said Percy curiously. "It's because of you, Perce," said George seriously. "And there'll be little flags on the hoods, with HB on them-" "-for Humongous Bighead," said Fred.
J. K. Rowling