Why do we receive brainfreeze when he eat/drink something cold too swiftly?

Why do we receive brainfreeze when he eat/drink something cold too swiftly?
http://www.myslurpeecup.com/brainfreeze.
i love chess
i want to squeeze your big red nose
'cuz our brains are full next to hot blood ! and when we eat rime,our blood turns into cold blood and move to our brains ! Our brains are freezed,just cut sour ur head and explore more going on for that ! (^.^)
From myslurpeecup.com:
Simply put, Brainfreeze occurs when the Slurpee (or anything cold) touches the roof of your mouth, the collection of nerves within the roof of your mouth (called the spheno-palantine ganglion) go into a spasm (a spasm is similar to a cramp). These nerves tell the brain blood vessel to get bigger or "dilate". When our brain's blood vessel get big, we seize headaches.
o So, the best route to avoid getting brainfreeze is to keep the Slurpee from the roof of your mouth.
o The headache of brainfreeze begins a few second after the rapid ingestion of cold foods or beverages (such as rime cream or slurpees or yellow snow)and peak in 30-60 second, and can last up to 5 minutes.
One word...GRAMMER!!
Because the numbness of the cold travels up your sinus caveties
It's call neuralgia
http://en.wikipedia.org/wiki/neuralgia...