Circus of pain
The twisted pleasures of Circa.When I first saw the Australian troupe Circa at the Edinburgh Fringe two years ago, I found myself cringing at some of their antics.But judging from its self-titled performances at the Paramount this weekend (a joint production of Celebrity Series and ArtsEmerson), Circa has only gotten more extreme. Indeed, watching some of these routines, you can't help but think (as y…