Running into Muppets in the stairwell

Convergence 2009 - Muppets
Originally uploaded by lostieborden

I passed these two on the stairway at one point while wearing my pirate wench costume. I said, "Oh, I love the Yip Yips!" to which they responded, in character as the puppets:

Yip Yip 1: "Cosplay."
Yip Yip 2: "Cosplay."
Yip Yip 1: "Run."