Bill Shatner as T.J. Hooker. Image sourced here.
A must-read GQ profile which does a great job of trying to explain the nature of Bill Shatner's iconic status and complex personality. Featured within the piece is the following:
"...Of course, Shatner refers here to T. J. Hooker, the early-1980s television show that served as a vehicle for the Caligulan feast of a toupee that The Washington Post once dismissed as a 'goony rug' but that is now universally acclaimed as the greatest hairpiece of the twentieth century."
In a literal sense, the opposite would appear to be true - that very few people see Bill Shatner's hairpieces (particularly those from the 1980s) as the greatest of the twentieth century. However, in a far broader sense, it's arguably the combination of Bill Shatner the man and Bill Shatner the toupee-wearer that have made his pieces the "greatest". Together, they are more than the sum of their parts.
Over the years the toup has done everything from subtly pointing to the emotional complexities of on-screen characters, to inspiring Star Trek's writers, to commenting on global political events. In that sense, Bill Shatner's toupees really are the greatest of the twentieth century...and here's to the twenty-first!