Everyone knows the children's game Duck-Duck-Goose. The dynamics of this game really never change as one ages, but when we're young it's just a lark.
Now imagine if that "goose" you picked turned out to be a buffalo instead? Well, that could change the game pretty quickly, right? One minute you're designating your friends as "ducks" and the next minute you're running for your life. Since out-running a buffalo is rarely required in real life, you can focus less on the training required for such a time, and buy a great tee shirt to wear... just in case!