riddle me this

[arethinn]

When I was 17, my mother could hear me coming in the house at any time of day or night, no matter how deeply asleep she might be at the time, and despite all my best efforts to be utterly silent.

Now she claims "oh, I didn't hear you come home" even if she's awake at the time, or if I come in rather un-silently while still slightly drunk from having been out clubbing.

Not that this is really a bad thing...