Yip!Yip!Yip at WonderCon 2009 Yip!Yip!Yip! #Muppet #cosplay at #WonderCon 2009 #TBT #ThrowbackThursday On Instagram Related Posts:Link: How a ‘Sesame Street’ Muppet became embroiled in a…The last time I went to a comic con in costume, I went as Jay…Zatanna & the Creeper. Another from WonderCon 2009TBT to the Flashes of WonderCon 2017!