First I showed the children this guy, they had no doubt "Oh That's Super Grover!" They called out!

Next I showed them this one, "It's MISS PIGGY!!!" was another of their correct answers.

I then took a picture of Cookie monster, and before they could sing "C is for Cookie!" they knew who it was. My oldest used up his guess first "They are all from the Muppets!" I had to tell him he was just very wrong... that is not what they have in common. (Especially because there was another picture I still hadn't shown them yet. He really does like to answer the question before it's completely given.)

When I unveiled this picture the children could only stutter out confusion, they had NO idea what all of the pictures had in common, other than that they were all puppets, and I told them that wasn't it at all.

This guy. Once showing the kids clips of all the different people he plays they could hear it in the voice, but it was mind blowing that all of 'these guys" are "this guy"