Football for Newbies

My Wife has recently found a limited amount of interest in football all because we gave a puppy away to a gal who's fiance was trying to become an NFL punter. During one of our conversations last fall about giving the puppy to this couple, I was watching an NFL game and pointed out the punter to the Wife as an example of what this guy did. A little while later another guy came on screen for a field goal and when I told the Wife that he was a place kicker, she got all confused. Needless to say, she's still confused, but trying to explain all the position player to her has been entertaining. So far, her body of knowledge consists of what a quarterback is and that Emmitt Smith is a running back. From that starting point, here's yesterday's conversation during the 2nd half of the Miami-Cincy game yesterday:

(On the TV, the Bengals are lined up to punt)
Me: Okay, now what is the guy kicking the ball?
The Wife: He's the punter, no, wait, the place kicker, no, no, he's the punter.
Me: Are you sure?
The Wife: Yes, he's the punter.
Me: Good.
The Wife: Why is this so difficult?
Me: It's not, it just takes practice.
The Wife: Okay.
Me: Remember, the punter drops kicks the ball when his team doesn't make first downs and is to far away to kick a field goal. The place kicker kicks field goals and has someone hold the ball for him.
The Wife: Okay.
(a little while later, the Bengals are lined up to attempt a field goal)
Me: Now, which one is this guy?
The Wife: He's the . . . . . the place kicker?
Me: That's correct.

Unfortunately, I tried to press my luck by trying to add new position players and it just got more confusing. How do you explain that the RB comes out of the back field, but can catch the ball? And why WRs block? And exactly what a TE is since he can block and catch the ball? But it's okay. We'll just have to spend more quality time together watching football and that can't be a bad thing now, can it?