Ah, Valerie, don't be mean to toothy. He was the original emo kid. Seriously, watch some of their old videos, and he just looks SO sad, and you know he's not faking it. (That's a boy who obviously got picked on a lot in gym class, poor thing.) If I remember, he wrote most of their songs, so it's natural he'd be upfront. Maybe it just seemed odd because there was this more conventionally handsome guy hiding in the background, while this toothy little guy was in your face singing.
They should do one of "Never Gonna Give You Up" by the one-and-only Rick Astley