Cameron Diaz will display an impressive sex drive and filthy mouth in her upcoming comedy, "Bad Teacher." Turns out that, in real life, she can be even dirtier. Diaz goofs up alongside Justin Timberlake and Jason Segel in this gag reel for the film, which hits theaters June 24th. Diaz plays a bitter junior high teacher whose life gets thrown out of whack when the rich man she's set to marry dumps her -- now, she actually has to teach indefinitely, not retire once she gets that ring. Justin...