I use three hyphens. In my case, I picked it up from Knuth's TeX many years ago; it's a lexical notation which typesets to a proper em dash. Three hyphens---it

I use three hyphens. In my case, I picked it up from Knuth's TeX many years ago; it's a lexical notation which typesets to a proper em dash. Three hyphens---it looks good! When I use three hyphens, it's like I dropped three fast rounds out of a magazine. It demands attention.