Remember when Britney Spears [1] said she'd never met Taylor Swift [2] even though there was photo evidence of her meeting Taylor [3]? That was funny. Anyway, this mashup of Britney's 2004 hit "Toxic" with Taylor's new headline-making single "Look What You Made Me Do" [4] was definitely not something we asked for, but it actually sounds pretty sick. Check out the video above to see for yourself.