What resulting human activities through the centuries are just plain manifestations of boredom?

I know running sports probably came about when cavemen got bored and started chasing gazelles. Later, they figured the one who run the fastest catches the gazelle and therefore gets laid that night without bonking any female on the head with a club.

After they ate all the gazelles, they still race to see who was the fastest in order to continue getting cave action privileges.

But wait, this example is really about getting some, not boredom, right?! Man, I’m hopeless. Sorry, just go back and focus on the question please. : )