This hands-on contest offers impromptu on-the-road fun.
Two players each put one hand behind their backs. Each person turns that hand into a scissors, using the index and middle fingers; or paper, by holding the hand flat with the fingers straight; or a rock, by making a fist.
Both players say "One, two, three," and show their hands. The scissors beats paper because it cuts paper. Paper wins over rock because it can wrap around the rock. Rock beats scissors because it makes them blunt.