I found this posted by Gabriel Knight (aka John Blair) on alt.callahans.

Very early one morning two Brooklyn birds are sitting at the side of a large puddle of oil (courtesy of Exxon Valdez, perhaps?). They see a worm on the other side. So… the one flies over and the other one swims through – which one gets to the worm first?

The one who swam, of course, because “Da oily boid gets da woim.”