Jim says he usually has no idea who they are - or even if they are.
"Is there somebody there," he said when he met CBS News correspondent Steve Hartman
It's the first sign that Jim's eyesight ain't what it used to be.
Here's the second: Jim tells a customer, "I can't even see your ears."
Fact is, 64-year-old barber Jim Buist is legally blind.
One customer said: "I don't know how he does it, he's amazing."
Jim's been a barber for 40 years, but a blind one for just the past couple. A combination of cataracts, diabetes and detached retinas have made his view of the world fuzzy.
It's amazing he hasn't shaved off a lobe - and even more amazing, the number of people who trust he won't.
Jim still has dozens of regular customers. In fact, part of the reason he's able to do this is because he's memorized most of these heads. He also goes by feel … and by gut.
"It's instinct," Jim says.
Still, it should come as no surprise that Jim doesn't get a whole lot of new customers.
"If you're sitting there and you watch me cut somebody's hair, that scares people out," he laughed.
He says it's hard to find people with that kind of courage - and/or stupidity.
But Hartman decided to sit down in his chair anyway. Only because hair grows back.
"You got a good head of hair, I like digging into this," Jim said.
"Seems like there's a lot of hair falling down," Hartman said.
Jim replied: "Don't worry about it."
I thought I'd let him take a stab at it - hopefully not literally.