What, in your opinion, was the single darkest riff of MST3k's entire run?

For me, it is the 1st season references to a certain scene in Alfred Hitchcock's Frenzy:

"Love-ly. LOVE-LY!!!"

53:59 Better get to work on those o-rings.

A Challenger joke, Tom? Really?

♫ He likes to wear mittens! ♫ He has a deviated septum! ♫ He's a real big fan of Delta Burke! ♫ He gets his hair cut on Tuesdays! ♫ He prefers stuffing to potatoes! ♫ His favorite movie is Turner and Hooch! ♫

Operation Double 007

Wait a minute.... Is the building code ALWAYS under fire? That's the second time a newspaper highlight in a movie said that....

"What's the next trend going to be? Neofascism? Bank failures? Self surgery?" as far as predicting the future goes, 2 out of 3 ain't bad.

Sorry for a second post in 24 hours, but I have to share my good news!

Five days before the classes begin, I have been officially hired to work full-time as a visiting faculty! Alas, only temporary at the moment, but this is a step I haven't been able to take yet and full-time means full salary and benefits! I'll take what I can get.

So...

Hired!
I hope I don't get fired!
In 40 years I'll be retired
But for now I'm simply hired!

I've just realised: officer Kelton was also in Plan 9 from Outer Space.
That Kelton; he's seen some weird shit.

For obvious reasons, I always think of The Crawling Eye when I think of Diabolik. :) As Crow says, "This seems kind of familiar, doesn't it." So since the last riff of the day was Diabolik, here is The Crawling Eye:

"Give me six bags of onions and a giant eye chart!"

Was Joel feeding the bots 4K RAM chips?

"Let me show you something."
"...Television?"
"Better than windows."

Ten years later that would be a prime setup for a riff. There's even space for one after the line.