Here's an anthology of linguistics cartoons and comics I found on the Internet.
The next two are ones I drew in ninth grade.
Sources: xkcd.com, smbc-comics.com, theshirtlist.com, http://artjcf.tumblr.com/post/73517920837/hey-whats-that-sqiggly-thing-on-the-ground-i, cartoonstock.com, lingvo.info, http://languagelog.ldc.upenn.edu, bizarro.com, quantz.com, specgram.com, oddboxcomics.com, wondermark.com, theguardian.com, andertoons.com, and me!