Because dinosaurs went extinct 65 million years ago.
They heard them in the town square saying, "Coup, coup!"
Don't do it, man, you'll never hear the end of it!
Au revoir poo poo
I need to do a vowel movement!
A StayGosaurus
A Tyrannosaurus Wrecks. EDIT: Spelled "Tyrannosaurus" incorrectly.
Because the 'p' is silent.
Because their p is quiet.