When wasps attack!

Okay, maybe that's a bit of an exaggeration... ;)

For the past week or so, I've been finding wasps in my house, usually dead or in the process of dying. Not that I'm sad about this because, in my opinion, wasps got no reason to live. Anyway, the odd thing is that the majority of the bodies have appeared on or around the windowsill of the one window in the house that doesn't open, with no sign of where they've come from.

Curiouser and curiouser...