A Crappy Assumption

(I always have the habit of knocking on the toilet door at work before I open the door. We always keep the door closed. This particular day I knock and get no answer, so I try the door handle only to find it locked. I just figure someone is in there, so I go back to work. A little while later my manager comes in.)

Manager: “Was that you trying to get into the toilet when I was in there?”

Me: *thinking she was letting me know it was now free to use* “Yeah, it was me.”

Manager: “What the h***? Why would you try to get in when I was in there?”

Me: “I didn’t know you were in there. I knocked on the door and got no answer”

Manager: “Oh, I wondered why someone was knocking on the door, but really you should have known I was in there because the door was closed.”