I worked as a clown for six years. Some of the clowns I met, the ones with makeup on, could be really a bit off. I was more like a big kid and generally didn't have too many children afraid of me. I also got hit on by young 20 something girls which was kinda nice.
I started to dislike kids after awhile tho. I also would reccommend the movie Shakes The Clown if you really want to be afraid of clowns. The title song by Two Much Joy Afraid of Clowns is a highlight. Also it is one of Adam Sander's early roles. Its not a great film but it is rather appropriate for this forum subject.
The line fro the Simpson's sums up my view of what it was like being a clown comes from the episode where Homer was replacing Krusty and his quote is perfect.
When I see a child happy and smiling. I know they are going to jab me with something
There is nothing to fear with clowns. It the little rug rats around them you should be frightened of