After a life of hard work Paddy (no relation to the Paddy here!) finally has enough money to fulfil his dream and retire to the country. Being a life-long fan of racing he buys two retired race horses to keep him company on his farm. Unfortunately when they are delivered he can't tell the difference between the two of them. He calls his friend Mick and explains his problem - Mick suggests he should cut the tail on one horse short so he can tell the difference. A few days later some joker cuts the tail of the other horse and he is again confused. He calls Mick who suggests he put a nick in one of the ears of one horse. A few days later the joker returns and puts a nick in the ear of the other horse so he is again unable to tell the difference. He calls Mick again who suggests he measure the horses - maybe one is taller than the other? A few minutes later Paddy calls Mick again:

"You're a genius Mick - the brown horse is six inches taller than the grey horse!"

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"Computers can do that????" - Homer Simpson