How I Met Your Mother premieres tonight. Who's the mother? WE STILL DON'T KNOW! But my friend and I have some theories because we are nerdy like that. He thinks Ted will marry Barney's sister (who we've never met). I think it'll be Felicia Day cause she was all up in Dr. Horrible's Sing-Along Blog with NPH, so, like, why not? She's also in Save the Supers, which has it's series finale this Wednesday, so I mean… she's got a pretty impressive resume under her belt; she could just play herself on the show and win Ted's heart.