Unwelcome visitor

Every year at this time a few wasps wander into our apartment through the open balcony door. They never remember how they got in, instead spending hours flying against the glass window, getting angrier and angrier.

I now have a method of trapping them when they're inside. It involves a wide mouth glass jar, tin foil and the freezer. I usually catch at least a couple really big ones - I suspect they're queens looking for a new place to make a nest to overwinter in. Not in our house please!