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Some ideas are just bad. Very, very bad. Like this blimp powered by 4 helicopters. [Info and vid inside]
(hexbear.net)
The Piasecki PA-97 Helistat was an American experimental heavy-lift aircraft, built by Piasecki by fastening four H-34J helicopters to a framework beneath a helium-inflated blimp envelope. The sole prototype was destroyed during a test flight, killing a test pilot and injuring another four in the course of a single incident in 1986.
NSFW Video - https://www.youtube.com/watch?v=4KY3A2HlbzQ - it's barely off the ground when it crashes at ~1:00.
Hijacking the top comment to waste everybody's time to quote the Wikipedia article about paying more attention to me
I entirely forgot to mention that their name is VarietiesOfStupid.