Over at the usually science-themed blog Recursivity, Jeffrey Shallit provides a few literal answers to rhetorical questions, riffing on a theme started by Paul Brians in his Mr. Gradgrind's Literal Answers to Rhetorical Questions. The comments on Recursivity give some more examples. Popular songs seem to be good sources for questions:

Why don't we do it in the road?

Apart from being a violation of traffic and public indecency laws in most jurisdictions, it's highly dangerous. In one study, 63% of fatal traffic accidents involving a pedestrian were considered to be the pedestrian's fault.