"The World's Most Contagious Falsehoods"
I paid the $5 to get the high-res version, and printed it out onto 22"x17 paper with my big Epson 3880 inkjet printer.
I posted it where students can see it from outside the classroom, and it's definitely got some flypaper attraction abilities.
Information is Beautiful's Common Mythconceptions
Some topics are intended for a more mature audience, so I don't recommend it for middle schools.