"I thought this song was about a baby." I am in love with Mercerdes' snippy one-liners lately. They're just writing gold. That, and Mike Chang drumming on a cheese grater.
Watch Artie serenade Brittany with a (song) invitation to prom, and Jesse St. James sneak in on a Rachel Berry practice number, in these sneak peeks of this week's new episode, "Prom Queen":
Source: TV OverMind