So I totally see now how Kitchen Kung Fu got gored. These instructions are dumb and dangerous. I must have either missed or ignored them because here’s how I’ve been doing it.
First, shuck the ear, but don’t remove the stem. It’s handy to hold on to.
Then brace the top of the ear in the bottom of a bowl, like this.
Then you can push downward with more force, more safely. You have a lot more control pushing down than pushing up, and your non-cutting hand stays out of the danger zone.
Hope this helps – stir-fried sweet corn is too good to miss!