"OMG, so you go at red lights?" 

That's invariably the most common reaction to my revelation that I have red-green colour deficient vision. I'm mostly amused, and I start to explain that it's a little more complicated than that - I can differentiate some reds and greens quite easily, but not certain other shades of reds and greens. Let me attempt to regale you with facts about what I see (or do not see!).