NEVER LET ONE OF THEM LIVE.
I had two flys in my room.
I kept trying to kill em but they were too smart for me.
Meh, i'll leave it.
NEXT MINUTE THEY'RE HUNDREDS.
I killed one of their babies. and I could have sworn they saw it, because they all came flying directly at me.
I'm now currently cowering in the corner of the room with a shotgun.
daaaauymn flies!