16th on 21 interesting Facts About Google: On April Fool’s day of 2007, Google sent an e-mail out to its employees warning that a python was loose in the facilities. It wasn’t a joke.
Definitely sounds like a prank, I know, but it was true: an engineer kept a ball python named Kaiser in his cube and Kaiser escaped. The e-mail to employees apologized for the awkward timing and assured them that this was no April Fool stunt.
mentalfloss.com