People sometimes wander into my drum class from the front of the new age shop whose classroom we use. They are fascinated by the rhythms and by the fact that they see us ordinary-looking folks playing them.
The following video on YouTube is a great example of what it sounds like when people play djembe. (This is not the group I belong to, but in case you aren't familiar with real West African djembe playing, this is a good example.)
One typical characteristic of djembe drumming is that it is very, very fast. Research has shown that very fast drumming affects the human brain in a good way. It is conducive to deep trance, and it's very healing.