Cantor went mad thinking about infinity - to me, a clear sign of how worthwhile the OCD path is. To quote my favorite close-is-good-enough source, Wikipedia, "

Cantor went mad thinking about infinity - to me, a clear sign of how worthwhile the OCD path is. To quote my favorite close-is-good-enough source, Wikipedia, "Poincaré referred to Cantor's ideas as a "grave disease" infecting the discipline of mathematics".