A passerby watched two Irishmen in a park. One was digging holes and the other was immediately filling them in again.

"Tell me," said the passerby, "What on earth are you doing?"

"Well," said the digger,"Usually there are three of us. I dig, Paddy plants the tree and Mick fills in the hole. Today Paddy is off ill, but that doesn't mean Mick and I get the day off, does it?"