How many AI people does it take to change a lightbulb?

At least 81:

The problem space group (5):

The logical formalism group (16):

The statistical group (1):

The planning group (4):

The robotics group (10):

The knowledge engineering group (6):

The Lisp hackers (14):

The Connectionist Group (6):

The Natural Language Group (5):

The Learning Group (4):

The Game-Playing Group (5):

The Psychological group (5):