You find a piece of termite riddled pine with a big knot in tact...
https://i.imgur.com/OMlHRoE.jpg
And have a chunk of rusty sawmill blade...
https://i.imgur.com/7FF9YjX.jpg
Why, you make a neck knife with a fatwood knot handle of course.
https://i.imgur.com/tgGjctQ.jpg
https://i.imgur.com/TGNs1p0.jpg
https://i.imgur.com/myQDSrZ.jpg
https://i.imgur.com/MkYCUWu.jpg
https://i.imgur.com/ar1Aoie.jpg
https://i.imgur.com/nprZDZ2.jpg