1. Captain Underpants (series), by Dav Pilkey.
Reasons: Offensive language, unsuited for age group

from American Library Association – Top 10 Challenged Books, 2012 on Rap Genius

Meaning

Frequently banned because the books encourage children to disobey authority figures (the skimpy Halloween costumes that students wore in 2007 to a Long Island High School haven’t helped either). Still widely beloved and stocked in preschools, however.

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