Sprinklers, a crowded room of gentlemen reading newspapers and smoking cigars, snow, rain, foam, finish lines, pieces of tape, bits of string, the livingroom (if mom's not around), red rover barriers (if you're strong enough), your youth if you aren't careful, steaming piles of rocks (if you have strong feet and training), the night (if you're a werewolf, a vampire, or whatever the hell the people from twilight are), your imagination (if you can picture it), dreams (if you're dreamer), money (oh, money), and food (if you're a teenage boy going through puberty), walls (if you're shadowcat, aka kitty pryde, from "Uncanny X-men"), the air (if you're an action star).