Crazy Parental Moments

As you will have noticed, I write quite a few blogs on parents..just fyi it's because i have no siblings...and no life...(EXCEPT BIG BANG...7.00 EVERY WEEKNIGHT..AAAAAAAAAAAAAAAA)
Well the other day we were having a family viewing of Harry Potter one, (i.e. nothing else was on TV except Meet the Spartans...) and it was the part where Harry gets his new broomstick. As soon as Hedwig brings the package I exclaim, "It's Harry's new broomstick...the something 2000...", and almost immediately after my dad exclaims the Nimbus 2000...3
Is it normal that parents know those things???