BTW, if you want to know what color the dress is to a color-blind man who gets fourteen of sixteen wrong when he's shown pages of circles of dots and asked what numbers he sees, it's white and green or brown or something...
And yes, a little while ago I once again stopped at the edge of an intersection trying for the life of me to figure out whether the blinking light hanging over the intersection was yellow or red? When a car flew by me at sixty miles an hour in the lane to my right, I guessed yellow and got on my way.