Up the Mountain, Over the Cliff

Once, a man climbed up a mountain with nothing except determination. Once there, he strolled over the edge of a cliff and fell onto the rock which the caveman used to discover fire. The man immediately got amnesia and forgot about the rock. The rock was discovered only by the next unfortunate fellow to walk himself right over the edge of the cliff.

One clever civilian decided to climb the mountain from the bottom up, so that he could discover the rock without falling down the mountain and getting amnesia. The man got the rock, hauled it up the mountain, and walked right over the other side of the cliff, where he fell, hit his head on the whoever of a rock that was slinged at Goliath, and caught amnesia.

A passerby climbed the cliff from the side, so he wouldn't fall down either of the cliffs the previous two had. He collected the previous two rocks, climbed up the mountain, fell down the other side of the cliff, and bonked his head on Abraham Lincoln's tombstone and caught amnesia.
A traveler climbed up the last side, so as not to fall down the other three, and gathered the three rocks with success. However, when he reached the top of the cliff, he promptly walked right over the other side, hit his head on the skipping stone I tossed the other day, and....Well, I don't know what happens when someone hits their head on a skipping stone. I s'pose he would have died from the force of falling down the cliff in the first place.