Lisbon-based art director Joao Rocha created clever diptych illustrations of two choice that people will make given a specific situation and put them on a Tumblr called 2 Kinds of People. For example, do you break off the squares of your chocolate bar or say "to hell with the squares" and bite directly into the bar?
“There are only 2 kinds of people in this world," Rocha explains, "those that find this blog hilarious and those that have no sense of humor whatsoever." Rocha is also the creator of Kim Jong-Il Looking at Things, which you should also check out.
Here are a few more of Rocha's 2 kinds of people scenarios: