I don't know what my greatest fear is. But I know it would be so unimaginably scary that everyone in the room would shit their pants and die of a heart attack. So I don't think I'd have a problem with being in presence of others.
But yeah I thought the clown was waaay creepier than the spider or snake. Although I wish they showed the Banshee...I was curious of what it would look like. One of the students was scared of a Banshee (in the book)