21. Eli Marienthal as Matt Stifler, American Pie (1999) and American Pie 2 (2001)
Matt Stifler didn't reach peak-nuisance level until he got his own turn in the spotlight in the American Pie series' first unfortunate foray into direct-to-DVD land, but he wreaked havoc in small doses in the first two films as Stifler's (Seann William Scott) younger brother. Just as offensive as his older sibling, Matt has none of the original Stifmeister's charm.
You can't help but laugh at his reaction to Jim (Jason Biggs) and Nadia's (Shannon Elizabeth) sex stream in the first Pie. But he wore out his welcome in the 2001 sequel whenever the camera cut to his antics during the climactic house party.