Does an empty bathroom need the lights on?

I feel like my grandma when writing this one ("turn that light off")....but after walking into many a empty bathrooms, only to find myself and an already "ON" light as the only participants, I thought I'd write about it - this is one simple thing we can all do - not just because its the "right" thing to do, but also because:

• You will save money! This particular family saved $1250 a year on their electricity bill - i bet you could beat that if you have a big house, or lots of lights, or a tanning bed in your house. The less we all use, the cheaper it should get for everyone....I'm not econ major, but I think that works.
  
• You will save the planet. (you like your planet, all those green trees, blue water, right?) Lights on in an empty room = wasted electricity = more electricity needed = more powerplants needed. Whether you get your electricity from hydro, coal fired, or other (do you know where you get yours?) - it likely impacts our environment in some way (dammed rivers, nasty emissions from burning fossil fuels - can you say global warming?)
• You will feel smart and cool! Whether your driven by economic, scientific, or emotional reasons, a simple flick of the finger on the light switch when you're the last one leaving a room will make you feel like you're taking it to the man - one way or another.
  

This doesn't at all only apply to your home....I thought of it at work when I walk into the shared bathroom that is empty but well lit, or in the workroom that sits empty but lit half the day....oh, and I haven't even touched energy efficient light bulbs....

Think about it. Do it.