“Always laugh second.”

"Charles Dickens" (1939)
Context: The thing that drove Dickens forward into a form of art for which he was not really suited, and at the same time caused us to remember him, was simply the fact that he was a moralist, the consciousness of ‘having something to say’. He is always preaching a sermon, and that is the final secret of his inventiveness. For you can only create if you can care. Types like Squeers and Micawber could not have been produced by a hack writer looking for something to be funny about. A joke worth laughing at always has an idea behind it, and usually a subversive idea. Dickens is able to go on being funny because he is in revolt against authority, and authority is always there to be laughed at.

Source: One Day

1840s, Heroes and Hero-Worship (1840), The Hero as Poet

Source: By the River Piedra I Sat Down and Wept

"Are chess players intelligent?" Quality Chess Blog (6 October 2010) http://www.qualitychess.co.uk/blog/?p=630

Source: Pride and Prejudice (1813)

This has appeared rather prominently on the internet, usually without indications of a source, and is often attributed to Jobs, but it was actually part of the comedy routines of Emo Philips, who used "giggles" rather than "laughs" on his comedy album Emo.
Misattributed