Isn't that what killed Goose in Top Gun? Yikes, Dasher, you be careful up there. (The upside down one makes me dizzy just looking at it.)
Goose was killed when he hit his canopy.
Check out the video - inverted flat spins are "competition maneuvers" in advanced aerobatic competitions. We all do them.
Yes, that's what killed Goose - but I think it's different in Jets. I've never done acro in a jet - so have no first hand knowledge.