I've seen some terrible karaoke in my day.  Heck, I've even contributed to some terrible karaoke.  But without a doubt, this guy takes the cake on the worst version of Carrie Underwood's song, "Before He Cheats"

He brings back memories of William Hung's audition on American Idol years ago that made him a short lived star.  Remember William Hung singing Ricky Martin's "She Bangs"?