Worst Performances: American Pie (1999), Tomcats (2001), Thir13en Ghosts (2001), Night of the Demons (2009)

The best performance of Shannon Elizabeth's career? Playing the foreign exchange student Nadia in 1999's American Pie, a role that allowed her put on a hokey, playful accent. And, of course, going topless didn't hurt the cause, either.

In all of Elizabeth's subsequent performances, though, she's unconvincingly tried to show a range of emotions. When she's trying to be scared, like in Thir13en Ghosts, there's legitimately a reason to call her "flat." When it's time to be funny, she somehow makes already dull punch lines seem, yes, flat (see: Tomcats). Here's to a few more American Pie sequels, if only to see Elizabeth at her best.