One of my FAVE failures: McDonnell XF-85 Goblin
What WERE they thinking?
They were probably thinking it would be awesome to deploy a swarm of small fighter planes by dropping them from a bomber. In which they were absolutely right, it hardly gets any more awesome than that. Unfortunately, it also doesn't get much more impractical than that, which was apparently casually brushed aside to satisfy the rule of cool. Unfortunately, reason set in before it was taken in production.