Watch, scoff, tweet. Such is the ritual of “hate-watching” these days — particularly, this time last year, when Sound of Music Live! aired on NBC. Although critically panned, the three-hour musical starring Carrie Underwood, Stephen Moyer, Laura Benanti, Audra McDonald and Christian Borle was a ratings hit — 18.5 million viewers watched live , with that figure growing to nearly 22 million with DVR — and an endless source for trending topics on Twitter.