Johnson gets the Giggles

Johnson could not stop his merriment, but continued it all the way till he got without the Temple-gate. He then burst into such a fit of laughter, that he appeared to be almost in a convulsion; and, in order to support himself, laid hold of one of the posts at the side of the foot pavement, and sent forth peals so loud, that in the silence of the night his voice seemed to resound from Temple-bar to Fleet-ditch.

(1773, when Johnson was 64)
James Boswell, Life of Johnson