Abraham Lincoln had humour. Here is a great story that was handed down to me (the author). I have not yet been able to find footnote verification of it that it was actually said by Abraham Lincoln, but it's the kind of story that he should have said, in case he didn't. It illustrates Lincoln's dislike for pomposity and people who put on airs.
The story goes that he had a particular General who liked to send dispatches that were always headed: "Headquarters in the Saddle." And everyday, or every other day, Lincoln would get one of these messages entitled "Headquarters in the Saddle." And he got quite annoyed with this, but he kept quiet, as he normally did, until, finally, one day somebody asked him about this General and about this habit of heading all these dispatches "Headquarters in the Saddle." And Lincoln said, "It seems to me that the General has his headquarters where his hindquarters ought to be."
On another occasion, he was confronted by a group of Washington officials who were complaining about General Grant and the fact that there was a rumor going around that General Grant was a regular drinker of alcoholic beverages. And Lincoln replied, "By the way, can you tell me where he gets his whiskey? He has given us successes, and if his whiskey does it, I should like to send a barrel of the same to every General in the field."