It is that horrible beeping noise mobile phones make when their battery is running low and they need to be recharged.
A) It's not coming from my phone;
B) It's not coming from The HouseMatt's phone;
C) It is coming from somewhere in the iPartment; and
D) I can't work out where in the iPartment it is coming from.
Yes, I am being haunted by a ghostly mobile phone (with a low battery). Don't ghosts have chargers these days?