When youv'e looked at your hand while cutting, said "It's only a flesh wound" and kept moving.
When you've cut yourself and not known it until you see blood.
When you've spent time watching, critiquing, and sometimes calling in to harangue, the morons on HSN/QVC.
You actually know what "surgical stainless steel" is, and why it sucks.
You've ever used the phrase "That's not a knife, THIS is a knife!" in non-knife company. Bonus points if you refer to someone's dull SAK while pulling out a Military.
By the time you read this, you'll have already read it.