Once, I was at a petting zoo that was there to raise awareness for endangered species, and I got to hold the most adorable, fluffy chinchilla…
…which then proceeded to poop all over me.

My 8th grade Biology teacher once told us a story of his uncle, who raised chinchillas and would let him hold the soft little creatures. The kids were enchanted.
Then he elaborated that the chinchilla farm was for their fur. The kids were mortified. One girl cried.