*I'm Irish - I can tell this one*
Paddy goes to the doctor - he's a wee bit on the heavy side and wants to drop a little weight.
"Well, Paddy," says the doc, "I've set up a routine for you. Eat as you normally do for 2 days, then skip the next, eat normally again for 2 days and skip the next - keep that routine for 2 weeks and you should be 5 pounds lighter when you come back."
Paddy is back in 2 weeks; the doctor is astounded - Paddy has lost 60 pounds!
"Jesus, Mary, and Joseph, that's incredible!" cried his doctor, "did you follow the diet I gave you?"
"Aye, doc," replied Paddy, "I thought that 3rd day was gonna kill me."
"Sorry," the doc apologized;" it was pretty hard going without food, was it?"
"No, doc," says Paddy, "it was all that f#@king skippin' !"