I Told Ya So

An elderly lady on a cruise ship wanders up to the bar and asks for a scotch with two drops of water. As the bartender gives her the drink she says, "I'm on the cruise to celebrate my 80th birthday, and it's today."
The bartender says "Well, since it's your birthday, this one is on me."
As the woman finishes her drink, the lady to her right says, "I would like to buy you a drink too."
The elderly matron says, "Why, thank you. Bartender, I would like a scotch with two drops of water."
"Coming up," says the bartender.
As she finishes her drink, the man to her left says, "I would like to buy you one as well."
The lady says, "Thank you. Bartender, I would like another scotch with two drops of water."
"Comin' right up." As he puts the drink down in front of her, he says, "Ma'am, I'm dying of curiosity. Why the Scotch with only two drops of water?"
The 80 year-old replies, "Sonny, when you're my age, you learn how to hold your liquor. Water, however, is a whole other issue."