This thread says more about the posters than their dads, especially their ages! I find it a bit worrying that I recognise a lot the songs that their Dads were singing as being of my generation!

My Dad, now over 90, used to sing:
Here's to the good old whisky, drink it down, down, down, (x2)
Here's to the good old whisky,
That makes you so frisky,
Here's to the good old whisky, drink it down.

Chorus:
Drink it down, drink it down,
By the light of the silvery moo-oo-oo-oon,
Happy shall I be with the bottle on my knee,
And the shadow of the glasses on the wall.

And many other verses about other alcoholic beverages, even though my Dad was not really a big drinker!