"Just at the moment when he's due to laugh, he scowls."  From Pearson's, 1909.

"Laughing gas."  From Ambition magazine, 1911.

"Behind him boomed the vast laughter of Sant' Anna."  From Harper's magazine, 1917.

"My castle's burning, eh?  Ha-ha!"  From Over the Plum Pudding by John Kendrick Bangs, 1901.

"The world looks on and laughs just the same.  Why?"  From 1897.

"The good-tempered man laughs," from The Sketch, 1901.

This is utter bullshit and the perfect example of my horror (not too strong a word) of the cold, soulless mentality of white-coat scientists (whom Robert Anton Wilson dubbed the New Inquisition).  From Popular Mechanics, 1924.

"Of course you try to carry it off lightly, and bandy merry quips, but your heart isn't in it."  From The Saturday Evening Post, 1920.

Be this guy.  From Judy, Or The London Serio-Comic Journal, 1877.  Previously, we were inspired to be this gal with opera glasses, and before that we were inspired be this gal who isn't bothered by a timed test.

"The British habit of laughing at a joke five minutes after it is uttered."  From "As Others See Us," Cassell's, 1894.

"The 'laughing' feeling when taking gas."  From The Sketch, 1911.

Postcard drawn by F. Bluh, 1910.

From Christmas Cheer by Angus Reach, James Hannay and Albert Smith, 1856.

"If you feel like laughing, go as far as you like."  From The Book of Spice by "Ginger" a.k.a. Wallace Irwin, 1906.

Thanks to Malo for the doodle!