Hitting a bird while golfing

[RoundGuy]

Yesterday, Rob Lowe of West Wing and Brat Pack fame was playing a Pro-Am tournament in Des Moines. On one of his shots, he hit and killed a Goldfinch in flight (Iowa's state bird).

Lowe: "That's unbelievable. Who comes here and kills the state bird? Only me."

Now, on the news today, someone put the odds of him doing this at 240,000,000 to 1.

Please explain to me how anyone could possibly even begin to put odds on an event like this.