If Rambo would read this, he would laugh. He would shave with a serrated knife.
He was a masochistic, glutton for punishment.
I tend to sharpen my kitchen knives with a smooth edge. They can cut very thin slices off a ripe tomato. Scratched or serrated edges tend to make a mess of a ripe tomato.
Of course if you have a tomato that is as hard as a baseball, then maybe the sawing action is helpful.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)