You say there are two types of people?" "Yes, those who separate people into two groups and those that don't." "Wrong.

"You say there are two types of people?"
"Yes, those who separate people into two groups and those that
don't."
"Wrong. There are three groups:
Those who separate people into three groups.
Those who don't separate people into groups.
Those who can't decide."
"Wait a minute, what about people who separate people into
two groups?"
"Oh. Okay, then there are four groups."
"Aren't you then separating people into four groups?"
"Yeah."
"So then there's a fifth group, right?"
"You know, the problem is these idiots who can't make up their
minds."