Why you should never question a Drunk...

I was shopping at the local supermarket where I selected:
A Litre of low fat milk
A Dozen eggs
A 2L bottle of orange juice
A lettuce
A Container of coffee
A 500g of Rindless Bacon
 
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 indeed had never found Mr. Right.

I looked at the six items on the belt and saw nothing particularly unusual
about my selections that could have tipped off the drunk to my marital status..

Curiosity getting the better of me, I said, 'Yes you are correct.  But how on earth
did you know that?'

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