For me, it's the way the some men shave. The whole swipe from one corner to the other, all in one pass. I just don't understand the method behind it.
Also, how a some barbers (mostly European) DO NOT use hot towels or decent quality products when giving their customers a shave. They strictly rely on boar brush dipped in hot water and whatever cheap, low quality soap/cream they happen to have. They mix the lather on the client's face and begin to shave. Sometimes you can see how the razor drags rather cuts through properly the whiskers.
Also, how a some barbers (mostly European) DO NOT use hot towels or decent quality products when giving their customers a shave. They strictly rely on boar brush dipped in hot water and whatever cheap, low quality soap/cream they happen to have. They mix the lather on the client's face and begin to shave. Sometimes you can see how the razor drags rather cuts through properly the whiskers.