Lower Your Voice!
There is someone who sits 2 rows away from me at work that when she speaks, I hear every word. She has a very loud voice and she uses it when she goes to someone's cubicle (even farther away from me) starts talking to them like they're across the room. I think she got a clue recently when the person who she was talking to responded to her comments in a low voice. He was only a few feet away from her too. On top of that she admits she just like talking alot and expressing her thoughts all the time.