Halloween costumes at work

Is it a good idea to wear or have your employees wear Halloween costumes to work? This is my question. I can see it as being a good idea as a way to liven up the store and as a way to make to customers happy. But the down side could be some people find the costume offensive in some way. Customers could find some costumes as either to scary or inappropriate. I believe there are some places where it’s a good idea. Some examples would be restaurants, bars, and even most retail stores. Places where it would be a bad idea to dress up would be a doctor’s office or even a hospital. What do you think?