One of These Things Is Not Like the Others

Most Sesame Street fans are familiar with this game.  Four things are presented, and you are supposed to identify which one is "different."

Click to view... Time to Play the Game.

I understand that the whole idea is to get little children to use their brains to solve a very simple puzzle, but I would LIKE to see and participate in more challenging levels.  It's a neat idea for a game, even for adults.  You just have to make it a little bit harder.  Like, here is one that I came up with.  Who doesn't belong here, and why?

Give up?  (I hope not, it was kind of easy.)

Harvey Kneeslapper has hair on top of his head, and therefore does not belong.  The other three are all baldies.  Gordon is classic cue-ball bald, "Mr. Johnson" has male-pattern, and Kermit is an amphibian.  So that one was KIND of easy, but you would probably have to think about it for at least a MINUTE.  Not like when you are shown a tulip, a rose, a daffodil, and a chunk of cement.  "Which one doesn't belong?"  "Uhhhhhh..."

I spent weeks trying to come up with a really difficult one, but also one that would still be fair.  It can't be TOO difficult, like some rare technicality where Cookie Monster had never happened to eat a certain type of dessert or household appliance.  I really believe that a slim percentage of the population just might be able to figure this out.

*one of these things is not like the other*

Which is it?  and why?

If you really can't figure it out, e-mail me and I'll give you the answer.  If you DO figure it out, don't expect a prize.  There isn't one.

Click to view... The Bonus Round.