Our worst nightmare!

[colleenezzell]

I hope this shows up properly.  I pinched it from another site I frequent.

[jmlaidlaw]

Should read: "House of Grammer Horror's," of course. (Although, technically, that's to do with punkchuation.)

[luce-neidert]

Skaree!

[versailles]

I don't got the joke.

[booksist]

Me didn't understood it neither...

[resultsassoc]

That's because it's a very complex joke, and the punchline is encoded in the colors of the characters' shirts. Once you catalog the colors, in order, and create a four-variable (versus twelve-variable) Babbit's Matrix, you need to find the retrograde inversion, which reveals the punchline.