Barfly: You know you can tell what kind of red it is by looking at it in the glass.
Me: I'm not sure that's true.
Barfly: It is. It's all about the colour.
Me: I think you'd really need to taste it.
Barfly: Not true. I can tell that your wine is a... Shiraz.
Barfly: Taste it!
Me: I'm... I have to sit down.