I think the best one that I didn't write was a long back-and-forth argument in a C header file where TRUE was defined as 0 and FALSE as non-zero. The original a

I think the best one that I didn't write was a long back-and-forth argument in a C header file where TRUE was defined as 0 and FALSE as non-zero. The original author of this product apparently had screaming fights about that being THE RIGHT WAY. Of course that surprised a lot of developers over the years and had been "fixed" several times only to be reverted back.