how did amazon know?

[jenniekitty]

Just set up an amazon account. (way hey my first internet account...) and it suggested this for me to buy...

http://www.play.com/DVD/DVD/4-/11307379/Make-The-Yuletide-Gay/Product.html

Yes I know that link is on play but amazon didn't tell me what it was about so I decided to go see :P