Ben Franklin, making fart jokes.

The Pleasure arising to a few Philosophers, from seeing, a few Times in their Life, the Threads of Light untwisted, and separated by the Newtonian Prism into seven Colours, can it be compared with the Ease and Comfort every Man living might feel seven times a Day, by discharging freely the Wind from his Bowels?

via In the Archives: Fart Proudly by Benjamin Franklin 1781 | Humor in America.