A) Sock Goblins stole them for an impromptu sock puppet show.
B) A rogue washing machine had an identity crisis and ate the socks for its soul.
C) The missing socks were actually aliens from the planet of Lost Socks, seeking to understand human footwear customs.
D) Brian's cat, Mr. Whiskers, was secretly a sock connoisseur with an insatiable appetite for striped ones.