A football helmet I did some time ago. The reason I say "Hail Mary" is because I did not do the 3D scan for this one myself. I was sent the scan data which was quite terrible. Honestly, I wouldn't even know how to do such a bad job. But in any case, I managed to save it and create what I believe is the true shape of this model, including the interior. As far as I know this was used for VFX.
I have improved my modeling skills significantly since so I'm sure I can do a better job nowadays. It still only took me about three days to model in Blender.