Pants to your girlfriend

With two male teenagers in the house, we've developed the practice of throwing clean pants and socks onto their beds and letting them out them away.
Yesterday afternoon, eldest son brought new girlfriend home, but didn't tell me. So I, clean shreddies etc in hand, kicked open his bedroom door and launched them at his bed. At which point I noticed son and girlfriend talking (yes, just talking). Managed fulsome apologies before the undertrawlies hit their target, then withdrew to barely suppressed laughter.
Joys of parenthood...