There are all these simple little games that people play using their surroundings: don't step on the cracks, balance beam railroad tracks (or curbs), bicycle slalom, etc.
My game in the car was to use my hand to jump over driveways & telephone poles and swoop down into ditches...just a small flick of the wrist in the wind is all it took. Haven't done that in years. I still occasionally play don't step on the cracks and fight the daily urge to jump and touch. (via ★interesting)