If a certain little extinction-level event hadn't turned all the dinosaurs into Exxon executives' paychecks, there's a pretty decent chance that you would be reading this article with your creepy lizard eyes, fondling your crotch with your tail instead of your left hand. (Yes, we know.)
There are a whole lot of different theories on dinosaur evolution, but by far the funniest one, and therefore the one we choose to focus on, is courtesy of paleontologist Dale Russell, and it looks like this:
His name is the lizard equivalent of "Gary."
That is what Troodons, a species of dinosaur, might have ended up evolving into, had they not been space-punched into oblivion. Troodons lived in what would eventually become Canada, and were well on their way to dominating the world before disaster struck. They were two-legged and had a brain proportionally six times larger than that of any other dinosaur. What's more, they had not one but two opposable fingers on each hand, making them the seven-minute abs of the digital arms race.
Obviously, if evolution had decided to put these guys in the driver's seat instead of us, civilization would look quite different. Dinosaur humanoids (or dinosauroids) wouldn't require too much dental care, what with having toothless beaks. Their internal genitalia would render tall buildings, Hummers and other phallic symbols meaningless. What's more, they wouldn't have mammary glands and would feed their young by regurgitating food from their mouths, bird style.