Trivial General Dynamics F-16XL
Yep. You know the composite layup for the skins is like an inch and a quarter thick at the root. XL was really heavy. I remember the rollout, a big affair with local media types. The radar wasn't installed yet, so the moment the tow bar was disconnected from the nose strut, the plane promptly sat back on it's tail. Too funny. They had two shop guys hang on the nose to pull it back down so the tow bar could be reattached before pictures were taken.
Here's a little known factoid explaining why that thing was ever built in the first place. Here's the design team. Three middle-aged men and a 20-something kid who just happened to be the youngest son of the CEO of the corporation. You figure it out
