Yes, it's true. Disneyland and Disney World have a problem with people pooping while waiting in long lines for rides. Apparently you can read about these magical experiences with some frequency on the Disney World and Disneyland subreddits.
"I am in the queue for [Rise of the Resistance] – someone let their kid take a dump on the floor and then they just walked out and left it- WTF?," — Read the rest