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 Sources for Lincoln laughing when he was shot 

I have several sources that write about Lincoln laughing when he was shot; 

""While waves of laughter echoed through the theater, James Ferguson kept his eyes focused on Abraham Lincoln...the president joined the crowd with a 'hearty laugh...""- The Darkest Dawn: Lincoln, Booth, and the Great American Tragedy by Thomas Goodrich

""...it is a comfort of sorts to know that the bullet hit Lincoln mid-guffaw. Considering how the war had weighed on him, at least his last conscious moment was a hoot.""- Assassination Vacation by Sarah Vowell"