[Satan]

I'm not sure how you can shave incorrectly

Go sideways with the razor.
Circular motions.
Too much pressure.
Too much speed.
Going with the grain.
Using vodka instead of shaving cream.
Using a banana to shave with.
Using a butter knife to shave with.
Having your younger brother shave you.
Having your sister shave you.
Having your dog shave you.
Not shaving at all.

Tada. I compiled a list of common mistakes people make while shaving for you.