Newton and Leibniz
Permanent link to this comic: http://xkcd.com/626/
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Newton, 1666
[[A guy with long white hair holds up a sheet of paper.]]
Newton: I've invented calculus!
Leibniz, 1674
[[A man with long black hair holds up a sheet of paper.]]
Leibniz: I've invented calculus!
Newton: Really? Sounds a little bit...
[[Newton puts on a pair of sunglasses.]]
Newton: [[in italics]] Derivative.
{{Title text: YEEEEEEAAAAAAHHHHHH!}}