The ghost who lives in my house

In the last while there have been a lot of strange things happening in the house. If I didn't know better, I'd say we had a ghost.

First there's the flashing lights in front of our house every day at breakfast, with some random bangs and crashes thrown in for effect.

Throughout the day, the house feels like it's undergoing earthquakes periodically. Plaster also sounds like it's falling from the wall (although fortunately there's no white chunks on the floor), and large booming noises accompany the house being shaken.

The front door of our apartment started sticking (even though it's the driest November in decades). The door handle was also rather loose, so at a certain point I started worrying that I'd get stuck in the apartment one morning.

The marbles in the house are no longer rolling to the same spot that they used to. Much to my disappointment, the houses here are such that marbles normally all roll to one end of the floor and disappear from the cat's sight and his limited attention span. Now, however, the marbles don't end up beside the stove, but instead roll to a metre before the stove at the end of the table: an ideal place to catch the cat's attention.

As I walked into the bathroom the other day, the plastic cover from the drain was moving - popping in and out of the drain like it was possessed.

The simple explanation for most of the above is the fact that the neighbouring house is being stripped bare and having its foundations replaced (12 huge poles - hence the tremendous noise). The lights flashing in front of the house are from the truck coming to pick up the container full of old building materials. With all the shaking, we're somewhat concerned that our house has been shifting and resettling because of the work next door (which explains my doorframe dropping a couple of millimetres). It might also explain the shifting of the lowest point in the house, although I'm not exactly sure how that could come to be.

And as for the moving drain cover? I still have no idea (and must admit that it was a bit freaky). I'll have to wait until I can ask my brother (a plumber) about it. I'm really hoping it has nothing to do with our neighbours, as I'm not sure I could handle what was wrong then, especially as they had already managed to mess with our sewage and water systems when they first started.