I once saw this really old horror movie. It was actually pretty hilarious how bad it was. The plot was that an oil company was drilling for oil in the frozen wastelands of the north and struck something with their drill that made a strange sound. When they pulled the drill out of the ground they found it covered in blood. Scientists and archeologists were called in they excavated what appeared to be a tail segment, fully fleshed and preserved. They brought it back to a laboratory to be studied further. To prevent the decay of the specimen, they kept it in the freezer, but the lead scientist, who had been working around the clock to analyze it, accidentally fell asleep at his desk, completely unaware that in his sleepy stupor, he had left the door to the freezer open. The specimen thawed out and but it didn't begin to decay, instead, it was growing and recovering.
They decided to let the specimen continue to grow so that they could see what would happen. To their surprise, it grew into a full sized brontosaur-like creature. Unfortunately, the creature proved too powerful to be contained and broke out of the containment unit it was being held in. It went on a rampage through the country side and sea side town, eating people and destroying buildings (this part was especially funny because they had built a very shoddy "brontosaur" on a car frame, with the wheels clearly visible, and smoke coming out of its nose).
They finally managed to catch up with it, and they blew it to bits with a tank. The movie ends with a large chunk of the creature floating to the bottom of the ocean, twitching and wiggling, and the words "The End?" pasted on the screen.
Needless to say, it wasn't really all that scary.