Ever had something the size of a legoman rattling around in your sinus cavity?
Lucky you. It tickles, I'm considering punching myself in the head to try and dislodge it. I don't know what it is and I only *hope* it formed in there.
Edit: I think it knew I was talking about it, it tickled me until I sneezed and then it came out, presumably with the intent of killing me to prevent its secret from getting out. It seems smaller now but I'm still going to photograph it for my collection of images entitled "Horrible things that have come out of my face"