As a very talented actor, skilled in the arts of whatever the hell not_scyess mentioned, and a playwright, I can clearly find a couple issues with the dialogue.
Of corse I did. Everyone our age watched those goofy over-sized puppets when they were growing up. What? You think black kids didn't watch the Muppets?
Now right here is where I run into two problems with snappy conversation (a number one objective for screenwriters). First, you stretch out the description of the muppets to include "those goofy over-sized puppets" when you could probably just substitute it with "The Muppet Show" or "The Muppets." Otherwise it sounds a bit unnatural.
Secondly, "You think black kids didn't watch the muppets?" I have no idea what context this is coming from, but unless they have some kind of running gag between them this sort of canned race joke should probably be left out entirely. Keep these two things in mind when writing for an audience. You want it to sound natural.
Also, lizard is spelled with one Z.
The X-Men joke is too soft. It's like a 'whoops, I guess I shouldn't leave my bike in the rain' into a 'ha, ha, daddy has cake on his face.' Try to punch up your humor so that it's more consistant, because audiences don't seem to take well to dry spots in the script.
And ending a sentence with the word Jeez is something I have a personal vendetta against. It's like saying "God Damn" but with more 50's hairstyles.
The joke seemed like it would almost have made it at the end, except that it just plain didn't connect in time. Again, try to squeeze unnecessary wording out of the script.
Of course, what do I know? I'm an idiot.
---
the kid's getting old, the kid's getting old
