When I was six years old.
Each time Jack H. Harris's Dinosaurus! aired on the local TV station in 1975 or 1976 (I can't remember whether it was WPIX or WWOR...), I was there.
One day, a lovely and plucky gal named Betty (Kristina Hanson) happens into the harbor in a motorboat while hunky construction team leader Bart Thompson (Ward Ramsey) is detonating explosives nearby. An explosion knocks Betty's picnic lunch into the water, and she dives in after it.
While the Neanderthal goes in search of his two unfrozen buddies, the islanders -- led by Bart and Betty -- team up and decide to make a last stand at the local ruins. They dig a moat around an ancient fortress and wait for the tyrannosaur to show up. Meanwhile, local politician and villain, Hacker thinks he could get rich off the Neanderthal...
So, we have a comment here about avarice and greed in a capitalist system. Or that may be giving Dinosaurus! too much credit.
Before Dinosaurus! has ended, there's a noble self-sacrifice on the part of the cave man, the brontosaur fails to elude fate, and ends up dying in quick sand, and Bart goes mano-e-mano with the T-Rex from the seat of a bull-dozer.
Imagine you woke up one day in the twenty-first century, Bart offers, by way of explanation, to Julio.
Because that's what happened with Dinosaurus! I told one of my friends I was going to watch the movie and how much it had meant to me as a child, and he said something along the lines of "why are you going to do that? Why do you want to ruin good memories?"