A young man was planning to get married and asked his doctor how he could tell if his bride is a virgin.

The doctor said, 'Well, you need three things: A can of red paint, a can of blue paint and a shovel.

The man was astonished and asked, 'So what do I do with these?'

The doc replied, before the wedding night, you paint your one ball red and the other ball blue.

If she says, "That's the strangest pair of balls I ever saw", you hit her in the head with the shovel.