When it's a very hot day, you might think opening your windows would be a nice thing to do. But no - even that comes with its own set of challenges.
During the summer months, an open window might let in a bit of a breeze but it will also let in flies. Why they come in, we don't know, as they spend most of the time they're in desperately trying to fly into the windows and get back out. But some say they are attracted to rubbish, ripe fruit and anything with moisture.
House flies are partial to any decaying organic filth such as rotting meat. And fruit flies are looking for sugary substances so will buzz towards any overripe fruit, patches of fizzy drink and even alcohol.