Guideline or Rule?

I know you all do it. You see the "Dry Clean Only" or "Not Dishwasher Safe" warnings and decide that, just this once, you'll ignore them. One time can't hurt, right? I mean, those are really just a guideline more than a rule. You'll be careful and put the heat on low. You won't even dry it. And you KNOW your nice, new water bottle will be juuuuust fiiiiine.

Well...sometimes all it takes is one time.

One of these things is not like the other. One of these things is smaller than the rest.