|Timmy was dork.|
The scene goes like this (and trust me, I have the film memorized, so I know):
Timmy: What do you call a blind dinosaur?
Dr. Grant: ... I don't know, what do you call a blind dinosaur?
Timmy: Doyouthinkhesaurus? What do you call a blind dinosaur's dog?
Dr. Grant: You got me.
Timmy: Doyouthinkhesaurus Rex!
For the record, it wasn't the "Rex" part, and no, I didn't think it was an actual dinosaur name!