At the windows as a hoard of bugs tries to get in to where the light is.
It's a little freaky.
And this afternoon I took some garbage to the garage where we store it up for trips to the dump, and I noticed a pronounced "humming" sound.
Looking for the source, I espied a great cloud of black flies in the far corner by the window. Buzzing it up all over the ceiling. Settling all over the glass.
A decidedly creepy sound.
As long as they all stay on the other side of their panes and doors as the case may be...