This recent riddle question had the poster comment that:
I came up with this last night at 3am when I couldn't stay asleep. The intended answer was " a balloon that tells lies"
Such riddles purport to have an interesting answer (which is pretty much the bulk of the enjoyment in solving riddles), which makes the question attract upvotes. However, when the riddle turns out to not actually have an interesting answer, it detracts from the entire point of posting riddles on this site.
From the comments to that question, it appears to more than a few people that such riddles are highly unsatisfying, and that they should not be encouraged.
What should be done (if any) to such unsatisfying riddles?