This cautionary tale from Overheard in New York provides me an opportunity to shamelessly boost my Google rating for sphenopalatine ganglioneuralgia (ice cream headache/brain freeze).
Overheard in New York | God Has Played a Cold Joke on Us All.: "God Has Played a Cold Joke on Us All.
Guy #1: Owwww! Fuck! Owwwwwwwww!
Guy #2: You won't get an ice cream headache if you drink it slower.
Guy #1: I'm trying, but it's too delicious!
--9th St. & 3rd Ave
And just for good measure: sphenopalatine ganglioneuralgia