scotch and two drops of water

[jedneck]

A man goes to the bar on a cruise ship
And orders a Scotch with two drops of water. As the bartender gives him the drink he says: 'I'm on this cruise to celebrate my 88th birthday and it's today.'
The bartender says 'Well, since it's your birthday, I'll buy you a drink.
In fact, this one is on me.'
As the man finishes his drink
the person to his right says
'I would like to buy you a drink, too.'
The old man says
'Thank you.
Bartender, I want a Scotch with two drops of water.'
'Coming up' says the bartender
As he finishes that drink,
the person to his left says
'I would like to buy you one, too.'
The old man says
'Thank you.
Bartender, I want another Scotch with two drops of water.'
'Coming right up' the bartender says.
As he gives him the drink, he says,
Sir, I'm dying of curiosity.
Why the Scotch with only two drops of water?'
The old man replies,
’Sonny, when you're my age,
You've learned how to hold your liquor...
Holding your water, however, is a whole other issue.'