Paddy and Paddy, two Irishmen, went out one day and each bought a pig. When they got home, Paddy turned to Paddy and said "Paddy, me ol' mate, how we gonna tell who owns which pig?"
Paddy says "Well Paddy, I'll cut one a ta' ears off my pig, and ten we can tell 'em apart"
"Ah tat'd be grand" says Paddy.
This worked fine until a couple of weeks later when Paddy stormed into the house. "Paddy" he said "Your pig has chewed the ear offa my pig. Now we got two pigs with one ear each. How we gonna tell who owns which pig?"
"Well Paddy" said Paddy "I'll cut ta other ear off my pig. Ten we'll av two pigs and only one of them will avan ear" "Ah tat'd be grand" says Paddy.
Again this worked fine until a couple of weeks later when Paddy again stormed into the house. Paddy" he said "Your pig has chewed the other ear offa my  pig. Now we got two pigs with no ears. How we gonna tell who owns which pig?"
"Ah tis is serious, Paddy" said Paddy "I'll tell ya what I'll do. I'll cut ta tail offa my pig.Ten we'll av two pigs with no ears and only one tail."
"Ah tat'd be grand" says Paddy. Another couple of weeks went by, and you guessed it, Paddy stormed into the house once more.
"PADDY" shouted Paddy "YOUR PIG HAS CHEWED THE TAIL OFFA MY PIG AND NOW WE GOT TWO PIGS WITH NO EARS AND NO  TAILS !!!!!!!!!!!  HOW THE BEGORRAH ARE WE GONNA TELL 'EM APART!!!!!!!!!!!!!!!!"

"Ah stuff it" says Paddy "How's about you have the black one, and I'll have the white one."