Doorknob Underwear

So after Brennan's nap today, I asked him to go get his underwear from the top of his dresser. He ran down the hall and then I heard his door close. He came running back to me with no underwear. Upon asking him where they were, he responds with "I put them on my door." Knowing ahead of time that my son is pretty literal, I grab the camera. This is what I found: