the creepiest thing is the totally unwitting implied pedo theme...I mean christ, "with a big stick and red top, I put it in my mouth and pop pop pop", plus the creepy slowness with which Mister Glasses hands him the lollipop makes it even more disturbing
You noticed it too, huh. I'd like to add it disappears in other shots, leading me to believe this is no ordinary fly. I feel some batman logic coming on...