Including "The Hangover, " five of this summer's 13 sequels are live-action comedies, such as Adam Sandler's family-oriented "Grown Ups 2" and "Kick-Ass 2" (Aug. 16), starring Aaron Taylor-Johnson as an angst-ridden high-school student turned superhero with no actual superpowers.

WSJ: From 'The Heat' to 'Hangover': The Summer Comedy Boom