Forgive the personal question, but did you wash yourself this morning?
We've been told for years that a morning shower is cheaper than having a bath, as it uses less water and therefore less energy.
(There's a whole other discussion about just how hygienic it is to lie around in a soup of rapidly-cooling water and soap scum, but we'll leave that for another time.)
So just how much cheaper is it?
Not as much as you might think, according to the electricity company E.On.
It has produced an "electricity menu", listing the cost of everyday activities.
It claims a bath costs just 10 pence. A shower comes in at 5 pence.
Frankly I find that somewhat unbelievable. One of the few things that sticks in my mind from school science is that water requires an immense amount of energy to heat up because of its high specific heat capacity. (See, Mr Conway? I was listening.)
Unless you're in the shower for an EXTRAORDINARY amount of time in the morning* or you've got a monstrous power shower, the shower must use less than half the amount of water that you would if you filled the bath.
My eyebrows went up when I read some of the other "costs". Boiling the kettle for your morning cuppa costs 2p. Really? I had expected that to be a lot higher, though if you have about 20 cups of tea when you're at home on a day off, I suppose it all adds up.
The point of the menu is to make all of us more aware about what uses a lot of electricity in the home - and what doesn't.
We all know we should use less energy if we want to reduce our bills, or if we want to cut the amount of carbon dioxide that's produced when the electricity we demand is generated.
This menu tries to tell us which cuts will have the biggest impact.
The man from e-on will be on the programme later to talk about all this. We'll find out how he arrived at these prices - and ask why he's encouraging us to cut back when electricity companies make their money selling the stuff to us.
But we'd welcome your thoughts too. How do you cut your energy use, and keep your bills down? If you can get your tips to us before the start of the programme, we'll use some of the best on air. Use the comments below - or send us an email or a Tweet. You can sign up to our feed here - Twitter
* Naga would like me to point out that while she can get ready in the morning in just 15 minutes, I take over an hour - so am the last person to comment on people spending too long in the shower.