The game of Spiders
When we were kids, my sister and I used to play Spiders.
One of us would make a shape of a five-legged spider with her hand and scuttle on the edge of the bed, not unlike Thing in the Addams family; the other would try to swat it. The trick was to take your hand away before it was swatted, otherwise you lost and it was the other's turn to be the spider.
No matter how fun the game was, it always ended with the backs of our hands red and sore, so I guess, in retrospect, it wasn't such a good idea; worse yet, it did nothing to improve my dreadfully poor reflexes.