THEATER: Room 17B
Photo/Jim MooreIn 2008, the troupe Parallel Exit was nominated for the Drama Desk's "Unique Theatrical Experience" award. Their latest show, Room 17B, suffers in comparison: not only is a great deal of their mostly silent shtick derivative, but the content aims for a comfortably light evening of what can only be described as "parlor theater." The four-man ensemble is in on it, with xylophonist extraordinaire Mike Dob…