The first thing you need to figure out is the intent of the speaker. Does he know what he's trying to say, and just has a problem with finding the right words to communicate with people who aren't thinking on the same wavelength as him, or is he intentionally trying to confuse people and make them think that he knows what he's talking about, when he doesn't have a clue? Perhaps his answers do make sense to himself, but to somebody who doesn't think like he does, it's gibberish.
He could start an answer by giving a metaphor that actually makes sense, and then drifts off into more literal territory
. "When it starts to rain, carry an umbrella. If you don't have an umbrella, find a newspaper or something and run very fast." Or he could mix two or more cliches together into an incomprehensible mess. "A bird in a hand is worth two to tango."