Adults who are fortunate enough to not work with other adults obnoxious enough to say “duh” may still remember this sarcasm-laced expression from their high school years. I still say it in my head sometimes. Like when I saw this viz – publicized on cheezburger.com. In the world of data visualization, “duh” can actually be a true compliment.
Source: Science of The Day: Study Shows Humans Really Hate Being Touched Anywhere by Strangers