XKCD Web Comic #1033: Formal Logic (described)

A web comic of romance,
sarcasm, math, and language.

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Scene: Drawing of the back end of a car with a bumper sticker that reads “Honk IFF You Love Formal Logic.”

Hover text: Note that this implies you should NOT honk solely because I stopped for a pedestrian and you’re behind me.

Warning: This comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors). Comic by xkcd.com. Described by BlindGadget under the Creative Commons license.