Because it's a house shared by young adults, and at the weekend they kept us awake with a huge Hallowe'en party with music, and they've woken us at night on other occasions. So if they're going to inflict their celebration on us, they can have it complete with the little ones knocking on their door and "begging"! They probably won't suspect us, they'll keep trying to accuse each other.
(Yes, I know, lighthearted, in case you didn't see the first time; very wrong to involve innocent youngsters in my annoyances. But I think it would be a cunning way of getting our own back.)