Though the Ad-Libs improv troupe bounced around several Dallas venues in its infancy, one thing seemed to stick: their sense of humor. After a few nomadic years, the group finally settled into an old warehouse on Ross Avenue and Routh Street in 1988, drawing more than 650,000 happy customers to downtown Dallas for the next two decades. Ad-Libs’ brand of comedy is unique, mixing improvisation with scripted sketches and prerecorded video bits. The group also offers a series of six-week improv courses that can fine-tune the skills of aspiring comics or simply help you get out of your comfort zone. Since being ousted from their longtime locale on Ross Avenue, Ad-Libs has taken up residence in the main showroom of Mouth, a new entertainment venue in Deep Ellum. Weekly shows run Friday and Saturday nights, and while the comedy’s clean, it’s probably not a great show for kids. Word of warning: if the phrase “audience participation” terrifies you, find a seat near the back.