Stoick's brain is better than EVERYBODY'S!

Yep. He set fire to Prosper's ship. Because in his mind it was a good idea. Meanwhile, there's Prosper, trying to figure out exactly how on earth this stupid creature could possibly be her biological father. She has her mother's genes. Same as Hiccup. All Prosper gets from Stoick is her voice and temperment.

Joke belongs to Tintin: The Secret of the Unicorn and the line is from The Big Bang Theory. I imagine Prosper would sound a lot like Meg from Family Guy when delivering this line