Do you often find yourself often chanting... "Yip Yip Yip Yip," or, "Nope Nope Nope Nope?" Chances are you used to watch Sesame Street and now you have this kind of Mantra in your head. Yep, we know it all too well. The martians from Sesame Street are captured here in our Yip-Yip costumes! They make the best couples or friends costumes because you can walk around all night being positive or negative using the quotes above. We think you're going to love the wacky fun and especially enjoy the nostalgia these guys bring up for everyone. But isn't that the magic of Sesame Street in a nutshell? Yep, uh-huh uh-huh uh-huh!