Speaking of dads... mine was a cop for a long time. His favoite movies just happen to be buddy flicks, which are most of the time cop movies. That being said, we always had a blast counting the gunshots to see if they matched up with how many bullets a gun can hold. More recently, movies have started to come out where counting the gunshots is part of the story (see Hollywood Homicide for example). Needless to say, my dad and I have become dissapointed.
My dad is the king of finding faults in movies. (Especially if it involves planes) We'll be watching a movie and he'll start laughing "Oh this is ridiculous, that could never happen! Look at that..." and then he'll start to explain what's wrong with the scene. It used to be really annoying, but now I'm so used to it, I find it funny. (Although there have been a couple of times when my Mom tells him to be quiet!)