AusielloFiles posted a “How I Met Your Mother” spoiler:

How I Met Your Mother is currently filming its 100th episode so I’m guessing you have some new news for us. Right? —Jack
Ausiello: Right! Exec producer Carter Bays says the climactic musical number will feature “a big chorus, a kick line, the whole thing. It’s a big celebratory episode.” Everyone in the cast gets a chance to sing, and that includes reluctant crooner Alyson Hannigan. “She didn’t want to sing,” says Carter of Hannigan, who expressed similar reservations prior to shooting Buffy’s musical episode. “But we gave her a little something. She’s got a nice, lilting little voice.” Musical extravaganza aside, Carter says, at its core, the 100th installment is “just a great episode of Mother. That’s what I’m proud of more than anything else. It’s another good episode like the 99 before it.”