An extensive tour followed, and Sum 41 enjoyed their boffo success the way all near-teenage boys would, with plenty of towel-snapping, groupie-loving, and self-deprecating, low-ball humor. In 2002, they returned to wax with Does This Look Infected? While the album was a bit harder-edged, it found the band just as jazzed as ever to mix punk-pop business with sophomoric pleasure: the video for "Hell Song" featured the fellas acting out a sort of rock star debauchery cage match with the aid of a few celebrity action figures. Metallica, Jesus Christ, and the Osbournes all made appearances in the hilarious clip.

It was not all fun and games, however, as their involvement in the charity group War Child Canada had Sum 41 lending a hand in the making of a 2004 documentary covering the effects of war in the Democratic Republic of the Congo. Five days into filming, fighting and gunfire suddenly erupted around them, and they barely escaped unharmed -- these events led to 2004's slightly more mature and serious effort, Chuck, named for the UN aid worker, Chuck Pelletier, who was instrumental in getting them to safety. The DVD Rocked: Sum 41 in Congo was released at the end of 2005 and the live album Go Chuck Yourself appeared the following March. Guitarist Dave Baksh left the band during the spring of 2006 due to creative differences, going on to form the metal-punk outfit Brown Brigade. Sum 41 continued on as a trio, and their first album as such, Underclass Hero, appeared in July 2007. The band eventually returned to being a quartet, replacing Baksh with guitarist Tom Thacker, and began to work on a new album. That new album, entitled Screaming Bloody Murder, appeared in March of 2011.