Because it is 1 in the morning and I am easily amused.
Also:
What did the dinosaur say when he saw a volcano erupt?
What a lava-ly day!
What's louder than a dinosaur?
Two dinosaurs!
What has a spiked tail, plates on its back and sixteen wheels?
A Stegosaurus on roller skates.
What do you get when dinosaurs crash cars?
Tyrannosaurus wrecks.
What did the dinosaur say when he crashed his car?
I'msosaurus.
and ofcourse:
What do you call a blind dinosaur?
Doyouthinkhesaurus.
What do you call a blind dinosaur's dog?
Doyouthinkhesaurus rex.