I once snapped my key in my lock and had to break a window and climb into my flat. Whilst sweeping up the broken glass I looked up and saw two cops through (what was left) of the smashed bedroom window...one with a tazer pointed at me and the other with his truncheon drawn. After explaining it was my house and producing some ID, the cop phoned the locksmith and glazer for me (he said they would arrive quicker if the call came through from a policeman). He then got his first aid kit from the car and helped me dress the gaping wound in my forearm that now was pissing blood from cutting it on the broken glass (later required 18 stitches).
He was one of the nicest coppers I've ever met.....the very fact he didn't tazer me left me extremely grateful.