When I ride the elevator alone, utility bills are the first thing I think of.

Whenever I ride the elevator alone, I think about how much electricity or water we’ve used this month.

Scenes

Alone in the elevator, I think of the bill. — When I ride the elevator alone, this month’s utility bill comes to mind first. I wonder what else I should cut back on at home.
Even after turning off the lights — As I left home, I turned off the lights in the rooms I wasn’t using. But when the elevator doors closed, I started wondering if that was enough.
It’s hard to judge by usage alone — Utility bills depend not only on how much you use, but also on the charges and when they’re calculated. So one small effort to save can’t tell me what the next bill will be.
Think of one thing you did today — Tonight, if I ride the elevator alone, I’ll try to think of one way I’ve already saved at home. It won’t guarantee next month’s bill, but I’ll still have today’s effort to look back on.
Let the worry and the action sit side by side — Even if I start worrying about the utility bill again, the saving I did today doesn’t disappear. I can remember what I actually did alongside those thoughts about the bill.