The first time it happened, we discovered the ants had gone winged and were ... well, in a mating swarm? In the basement. DH went down to deal with it.
It was not pretty.
From down there, echoing along the tile, all I can hear is screaming and yelling and the sound of something hitting the walls... "OH GOD THEY'RE EVERYWHERE!! MY EYES!!! OH GOD!!!"
He came back up, I had a bourbon poured for him. He showered first.
It happened yearly.