Are there any must-have traits, such as intelligence, humor, and integrity, that you look for in potential friends? Have you ever made exceptions? How did it work out?
For me, intelligence is always at the top of the list. Good sense of humor plus a double-shot of humility (the ability to laugh at one's self) are key. Beyond that, integrity (desire to contribute to the world in a positive way) is also extremely important. People who take pride in material possessions or brag about schooling or family money/pedigree are absolutely out. Blech.