According to this posting (about the eighth blip down) in the men's room in the cafeteria at my school, a cafeteria worker is required to wash his or her hands after handling any living animals. (as opposed to handling deceased animals which is perfectly sanitary and requires no hand-wahsing afterword) I found that interesting but apparently, as you may be able to see, some other scholar before me noticed this as well. I guess this person thought it would be funny to write out the joke for those who might have a hard time getting this one. Thanks for all you do "joke clarifier." Where would society's funny-bone be without you. What a service you bestow upon the community. Hopefully, someday I will stumble upon some hilarious derogatory remark you transcribed on a bathroom stall somewhere. Here's to you...funny guy.
I laughed out loud about the live animal handling hand washing requirements, though. I did not mean to suppress the reason that I took the picture by ranting about the obviously extremely cool person that wrote on the sign.