I had a couple favorite games growing up.
The first involved two or three players. One player was designated as the hitter, and was provided with pen and paper. The hitter would then write a secret number between 1 and 100 on their piece of paper. Once the number was written the other players would attempt to guess the number. However far off the other players were from the secret number was the number of punches they received. Turn to hit rotated each round.
The second was for two human players and one 90lb. formally trained German Shepherd, one of whom must have complete control over the dog. The game was normally played indoors. The player with control of the dog would secure the animal while allowing it to see the other player sprint away to another part of the house. Once the latter player had himself sufficiently hidden, the other player would release the dog. The game was over when the dog found the hidden player. Enjoy!