Oh, they can be nasty if you are not careful.
My housing area often have a family passing through , if you forget to close the window and your curtains are open, they will come in.
Just yesterday morning I heard them jumping from roof to roof tiles, and you can hear some "clang" sound and some screeches.
When I was looking after a Siberian Husky pup, they tried to snatch the pup when I was letting the pup out of the house for breakfast and relief itself.