What is the punch line?

Autumn tree (picture from here)

November. The crows are gathering on the yellow-leaved or barren trees. There is still a bit of sunshine occasionally but the days are getting shorter and the nights are getting longer. It is easier to be depressed at this time of year so a good joke can come in handy . I came across this one in a collection of Scottish Jokes. Read the joke and find out a good punch line for it. Feel free to post it as a comment if you want to share your ideas. The original punch line will be published among the comments of this entry, early next week.













A dram of whisky (picture from here)

The joke: Duncan McSporran, the barman in a small village, had a new customer who was very regular in his habits. Every day he would come into the pub and order three drams of whisky. After a while, Duncan asked him why he did it that way.
The man said: -"I have two brothers. One of them lives in Canada, the other in Australia. We never see each other so we have a special way of drinking: we each have one for ourselves and one for each of the other two. That way we feel that we are still in touch."
One day, the man came in and ordered only two whiskies. He drank them in the usual way and was about to go when Duncan stopped him with the words: -"I hope nothing has happened to one of your brothers."
The man turned and said: -"No, no. They are both fine."
-"But you only had two whiskies," said Duncan.
-"Oh, that! ( --- PUNCH LINE HERE --- ) " said the man.