Three blonde men are stranded on one side of a wide river, and don't know
how to get across.

The first man prays to God to make him smart enough to figure out how to
cross the river, so God turns him into a brown haired man and he swims
across.

The second man prays to God to make him even smarter, so God turns him
into dark-haired man and he builds a boat and rows across.

Then the third man prays to God to make him the smartest of all, so God
turns him into a woman and he walks across the bridge.