It looks like he really, really enjoyed his job.
Whatever you do at home should be your own business, but it should probably remain at home and not be brought into your place of employment. Check out the photo a Twitter user posted after an employee was fired and his desk area was inspected:

I don’t think that’s glue, folks. And I really feel bad for the new guy who has to sit there.
Via Tumblr
And this is the worst thing a roommate can leave behind: Guy Discovers Roommate’s Masturbation Tissues Now Have Penis-Shaped Mushrooms On Them