Yep!
I have shaved with a sharp knive -once!! it worked, but very tedious operation.
For straight razors, I used to watch my granddaddy shave with his straight razor and he would put a dab of his hand made shaving foam on my cheek and shave it off! I thought that was cool! He also had a razor strop and he used that for "dual"purposes!!
After I got a little older, the barbers always used straight razors to clean up around my ears and neck after my haircut.
I look back now I sure must have had a lot of faith in those barbers capabilities.