Batcrap

What I like is a certain ambiguity in a story, but I've come to understand over the years that that drives most people absolutely batcrap!

That kind of behavior made me more certain than ever that, once he was pushed to batcrap-crazy extremes, he'd be forced to see the depth of his obsessions, and then he'd start to develop a more realistic perspective on the whole health nut thing.

"God, that is such… such batcrap!" Edith exploded.