It is true that most of the companies will like the fact that their Logos have some kind of meaning, or the icon that they select will have some kind of relationship with the products or services that they provides. But, if you are not careful you might finished something like this:

1. Its suppose to be an adult taking care of a kid, but its look like the opposite.

2. A simple dental procedure.

3. I supposed to illustrate the facade of an oriental house, with the sun hiding from behind

4.  If we are not careful, our eyes can play with our mind. And that mouse could be confused with the genital part of a man.

5. Perhaps you might not see anything else than a couple dancing, but pay attention. And we will agree that it could be the Logo of a nudist beach

Source: The Logo Factor