It never stops amazing me how quickly my dogs pick up on my habits. Things that I'm not even trying to train them to do, they just learn on their own based on my daily habits. For example, my Lhasa knows that when I turn the TV off, it means I'm leaving the room. Automatically, as soon as the TV chimes when it is being turned off, he jumps up and goes into another room, before I even get up myself.
When it comes to having pets, it's all about how much you enjoy and appreciate them...and watching these little behaviors just adds to the enjoyment.