What is the best COD Zombies Easter Egg?

Peter's Grave (iOS Shi No Numa)

Fly Trap (Der Riese)

Casimir Mechanism (Ascension)

Original Characters Trapped (Call of the Dead)

Eclipse (Shangri-La)

Richtofen's Grand Scheme/Big Bang Theory (Moon)

Tower of Babble (Tranzit)

High Maintenance (Die Rise)

Mined Games (Buried)

Pop Goes the Weasel/No Ome Escapes (Mob of the Dead)

Little Lost Girl (Origins)