Irish Virginity Test Kit..........

Paddy 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 from a DIY shop: a can of red paint, a can of blue paint, and a shovel.'
Paddy asked, 'And what do I do with these, doc?'
The doc replied, 'Before the wedding night, you paint one of your balls red and the other ball blue. If she says, "That's the strangest pair of balls I ever saw", you hit her with the shovel.'

H/T Old Dude