No, I didn't mean files". It's flies. Tiny, pesky flies (they're called "sciaridae). And our plant pots at home are infested with them.
When the first ones appeared in our flat a while ago, Carolin prohibited me from swatting them; she found them cute and called them her little friends". Well, when she returned from a weekend at her parents yesterday, she had to sweep away "more than a hundred fly corpses, including the ones she had instantly swatted herself. She had been warned.
Choose your friends wisely, or as Seneca said:
Ponder for a long time whether you shall admit a given person to your friendship; but when you have decided to admit him, welcome him with all your heart and soul.