If you mean window, he wants to come in to use the loo. If you actually mean winder, push him away from your watch and don't let him perch on your wrist again.
this happened 2 me 2, i was asleep at about 8am, and i was awoken by 2 magpies pecking at my bedroom window pane, it totally freaked me out,it was like they were watching me, as the curtain was open, then on the way to work i kept seeing squashed birds in the road, which just added to my freaked out state of mind, so yeh magpies are wiered!!