What kind of silly games did you "invent" as a child?

For example, my grandma used to have this tiny circular swimming pool in her backyard.
When we visited her, my sister and I would play “I’m a little pony.”

The whole premise was basically that one of us would swim around the outside edge of the pool yelling “I’M A LITTLE PONY EATING MACARONI!” while the other would swim slowly and pretend to be a tortoise, saying “bumpity bump…bumpity bump…I’m a tortoise bumpity bump.”

Then at some arbitrary time we would switch roles. It was beyond ridiculous.

Did you and your friends/siblings have pointless games like this?