The ending really made the story. And your use of superventriloquism was much better than what was in the comics.

Your story aside, though, I would question whether it is the least useful superpower, even in the comics. How about shooting rainbows (as seen on the cover of Superman #125 - original series, below) or a mini-me (as seen in that same issue's story) out of his fingers? Those are powers that, thankfully, did not last.
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In any event, this was a fun story and really captures the show's style of humor and banter. Thanks for sharing it with us.

Joy,
Lynn