Lion or Gazelle?

 Otra de las frases al pie de los mails que recibo en el trabajo (SIC, gracias al copy & paste!):

"Every morning in Africa, a Gazelle wakes up.
He knows he has to outrun the fastest lion or he will be eaten.
Every morning in Africa, a lion wakes up. He knows he has to run faster than the slowest Gazelle or he will starve to death.
I don't know who is the lion or the gazelle in this world, but as soon as the sun is up, you had better be running."