A woman is on a boat cruise and sitting at the counter of one of the bars. She orders a whiskey with two dropes of water. "Coming up" says the barman. As he hands her the drink she says "Today is my 80th birthday". "In that case I would like to buy you a drink, in fact this one is on me", the barman says. She finishes her drink and a lady to her left says "I would also like to buy you a drink". "Thank you" she says and orders another whiskey and two drops of water from the barman. She finishes her second whiskey and a gentleman to her right says "I would also like to celebrate your 80th birthday with you, allow me to buy you a drink". She says "thank you" and orders another whiskey and two drops of water. As the barman hands her the drink he asks "why do you only have two drops of water?" She replies, "Son, when you get to my age, the one thing you do not know is how to hold your water!!"