Too funny... I went through the list last night and the wife kept laughing and saying, "That's so you!" The best one was when you don't kick the tires of the new minivan, but check out the amount of stow-n-go storage for your WDW luggage. We totally did this when we bought our minivan last winter. The poor sales rep just didn't understand.
To add to the list (if it's still open) you're a DIS Dad when you have the monorail spiels on your iPod and play them over the minivan speakers on trips to the grocery store.
What's worse is the other day, I played the "please stand clear of the doors" spiel as I pressed the auto-close button for the kid's sliding door. The wife just looked at me and shook her head. It made the kid laugh, though.
I'm just not right....