Dropped food on the floor - do you eat it?

Don't be shy - we've all dropped food on the floor but the question is - do you pick it up and eat it. If your toast lands butter-side down, is it ok to pick it up, spread some jam and finish it while no-one is looking? "The 30-Second Rule, A Decision Tree" by Audrey Fukuman and Andy Wright will take away the angst and time you spent worrying over whether something you've dropped is ok to eat - genius stuff.