"Still in Use", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
'Which one?' 'I dunno, it's your house. Just check each object.' 'Check it for what?' 'Whether it looks like it might have touched a paper towel at some point and then forgotten to let go.' '...' 'You can also Google to learn how to check which things are using which resources.' 'You know, I'll just leave the towel there and try again tomorrow.'