I said, earlier, that switching tenses in the middle of the last verse was a bit odd. But as I thought about it, I realized it wasn't, really. It's just conversational:

"You know what happened the other day? I slipped on the snow and (get this), this guy comes riding up, and he just laughs at me as I lie there, sprawling on the ground, and drives away!"

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(And I'd always heard that last line as: "Hang your head over, hear the wind blow," which avoids the whole lay/lie issue.)