Why should you use a qualified graphic designer?

It's not just so that the work looks great, but if you don't use a professional things can go wrong... Below are some great (and funny!) examples of signs that haven't been thought through, just for your amusement! Please exuse the quality of some of the images, hopefully they're still good for a giggle!

These ones below aren't really examples of bad design, but they are still quite funny!