A blooper reel is always a welcomed addition to any Blu-ray or DVD, because it gives us a glimpse inside the production, watching actors goofing around on the set and reacting to flubbed lines. Today, a gag reel has debuted for Judd Apatow's comedy This Is 40, even though it is still playing in theaters. This hilarious behind-the-scenes look shows Paul Rudd, Leslie Mann, Jason Segel, Megan Fox, Charlyne Yi, Melissa McCarthy, Chris O'Dowd, and even Green Day's Billie Joe Armstrong screwing up their lines. Be warned, though, there is R-rated language peppered throughout this reel that will surely tickle your funny bone.