On Charlie's first day at the office, John asks him "Do you like to play golf?"

Charlie says, "Yes I do".

John tells him "We need a fourth for Sunday at 8:00am and would you like to join us."

Charlie says "I would love to, but I might be 10 minutes late."

John says "No problem."

Charlie shows up on time, plays right-handed and shoots par golf.

Afterwards, John tells Charlie "We need a fourth for Sunday at 8:00am again and would you like to play."

Again, Charlie says "I would love to play, but I might be ten minutes late."

John says "No problem."

Charlie shows up on time, but this time plays left handed and again shoots par golf.

Afterwards, they are sitting around having drinks and John turns to Charlie and asks him "Charlie, last week you played right handed and shot par golf. And this week, you played left handed and shot par golf. How do you determine each week, which hand your going to play with?"

Charlie tells him "When I wake up in the morning, if my wife is lying on her right side, I play right handed; if she is lying on her left side I play left handed."

John says, "What if she is lying on her back?"

Charlie says, "That's when I'm 10 minutes late."

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