I was shopping at the local supermarket

[Fenlander]

I was shopping at the local supermarket where I selected the
following items:

A litre of milk
A carton of eggs
A carton of orange juice
A 250 gram package of bacon
A head of lettuce
A 1 kilo can of coffee

As I was unloading my items on the conveyor belt to check out, a
drunk standing behind me watched as I placed the items in front
of the Cashier.

While the cashier was ringing up the purchases, the
drunk calmly stated, "You must be single."

I was a bit startled by this proclamation, but I was intrigued
by the derelict's intuition, since I was indeed single. I looked
at the six items on the belt and saw nothing particularly
unusual about my elections that could have tipped off the drunk
to my marital status.

Curiosity getting the better of me, I said: "Well, you know
what, you're absolutely right. But how on
earth did you know that?"

The drunk replied, "Cause you're ugly."