A quick transcript of the conversation I had with my barber just as I was about to leave:

Barber: Do you have an umbrella?
Me: No, is it raining? (look outside, it's not)
Barber: Ah, wait a second
Barber runs off through the back, comes back with an umbrella.
Barber: Please, take this.
Me: But it's not raining.
Barber: Ah, but it might.
Me: No, really, it's okay, I live just round the corner.
Barber: (looking sad) Please? You don't even need to bring it back.

I took the umbrella. He also gave me a hairbrush.