OT: odd ways to sharpen ?

I saw Bear Grylls take gravel from a stream,smash them into a stick to sharpen his knife. He said it worked great. :rolleyes:
 
The edge of my dinner plate works well at getting the edge back, especially after clanging it against the hard plate when slicing through steak. Also the sides and/or lip of a ceramic coffee cup work well too.
 
Ive had good results with sharpening convexed edges with this arched mousepad I put together from sliding glass door parts and scrap wood a while back. I saw one but couldn't find it for sale so I came up with this. It gives me way more control than a flat pad. I like it for sanding convexed blade sides to.


 
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I bought a bunch of Buck diamond pocket sharpeners on Amazon. Other than that use can use a rock ' or the bottom of a porcelain cup
 
A stone found at the riverbank - aprox. 2" in diameter, rather flat and a little rounded and smooth from thousands of years with water and gravel rubbing it. Works greath on a dull knife.
 
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