The "Butt" of the Joke

I think I was a little to verbal at work about my frustration with coworkers taking a poo in our bathrooms. I am now the target of containers of mysterious brown substances being left on the ER desk when I am working. One even had a note asking me if I could identify what they ate for lunch the day before.

I wrote back on the bottom, "halibut fish and chips, coleslaw, and a pepsi" and set it back on the counter.

Thirty minutes later there was another post it note on the bottom that read, "OH MY GOD! You're right!"