I'm Batman!
I would think you would put in "I'm The Goddamn Batman!" at the end. It's great to see your awesome style of animation, especially when it is put in so many scenarios. This would have been better if Duke Nukem had been doing some actual killing. Well, he does get a good headshot at that one monster. The most amusing of all of these was probably the one from "Troll 2". 3Dee does a great job creating an extremely dopey voice.
It does seem like you could have done more for jokes. I was expecting Duke to get killed or something at the end. At least you really know how to play up his moronic personality and his tendency to use one liners. The part that was the most elaborate to me was probably the Star Wars one. It looks like Duke Nukem is making a comeback in terms of parody for obvious reasons.