‘Tammy’ trailer: Melissa McCarthy runs rampant

Melissa McCarthy is on the loose and up to no good in the new trailer for “Tammy,” her upcoming comedy about a woman who experiences a particularly awful day and then hits the road with her hard-drinking grandmother, played by Susan Sarandon.

The trailer, which you can watch above, showcases McCarthy’s comedic chops and knack for playing lovable eccentrics. It opens with her swaggering in slow motion to the sounds of Coolio’s “Gangster’s Paradise,” then donning a paper-bag mask and robbing, in the most bumbling manner imaginable, the fast-food restaurant where she works.

Elsewhere in the video, McCarthy’s titular character runs from cops, rides a jet ski, blows up a car and tries to “unrob” the fast-food restaurant with some help from grandma Pearl (who casually totes beer and whiskey in her purse).

In addition to starring, McCarthy co-wrote “Tammy” with her real-life husband, Ben Falcone, who directed the movie. The couple, who both grew up in Illinois but first met as members of L.A.’s Groundlings comedy troupe in the late 1990s, have worked well together before.

In the 2011 comedy “Bridesmaids,” Falcone memorably played an air marshal sheepishly enduring McCarthy’s crude advances. McCarthy’s performance in that film became her breakout role, earning her an Oscar nomination and catapulting her to headlining studio comedies such as “Identity Thief” and “The Heat.”

“Tammy” is set to open July 2 from Warner Bros.