On tonight’s show, only one contestant made it to FJ (one contestant was minus something; the other had zero).
Does this happen often - or has there ever been a show in which no one made it to FJ?
Alex mentioned it is rare, but it has happened. The guy in second hit the daily double and bet everything. Had he held back he could have made it to final Jeopardy, but I guess he would have ended up in second place either way.
Brian
I guessed Monday’s question, though I wasn’t 100% sure.
I did know monarchs originate in Mexico so was pretty sure.
Brian
According to Wikipedia - there was (at least) one show in the Art Fleming era in which none of the players were eligible for FJ, so it wasn’t held. Three new contestants appeared on the next show.
Tonight’s was indeed a pretty pathetic performance. 
Monday’s FJ was one of those where you either knew the question or you didn’t. I had no clue until Alex said it was where the insects wintered; then I knew immediately what the question was.
Also according to Wikipedia, the last time nobody had any money after FJ was January 18, 2016. Here’s the Jeopardy archive of that show. J! Archive - Show #7216, aired 2016-01-18
Two contestants were tied for the lead going into FJ, and both bet all their money and lost. The third contestant also bet all her winnings and also lost. Poor strategy by the third-place woman.
I said “what are butterflies?” for that one. I don’t know if it would have been correct without specifying monarch butterflies.
There was another clue on that same show, in the category “anagrams of each other”,
“An organ of sense & a long, distinct period of history”
I said “what are nose and eons?” That’s not the answer they wanted, but I wonder if it could still have been correct.
I remember that episode from the FJ round. Hard to believe it was more than four years ago! 
Perhaps not, as eons is plural and the clue called for a singular noun.
I ventured the same answer as @Robot_Arm.
Then, after hearing the correct response, I disqualified my answer for the same reason as put forth by @Dewey_Finn.
Ditto.
True, but a sequence of multiple eons could still define a single period of history. The decades of the 1920s and '30s are roughly the interwar period.
It’s not an open-and-shut case, certainly. I find it interesting when there are correct responses other than what the writer intended. I’m curious how the judges would have ruled on this one.
I always feel bad for players who don’t get to play FJ, but the Seth Rogen dude brought it on himself by going for the True Daily Double that late in the game. Kind of a bonehead move there. I get that he had to make a big wager to try to get within striking distance, and getting it wrong would have locked him into second place anyway, as N9IWP pointed out.
But had he left himself with even a single dollar, he at least could have stayed on stage until the end of the show. That’s gotta be worth something in experience points.
I knew it because I’ve watched The Venture Bros. religiously since it began.
P.S. That was Monday’s show? It’s 11:30 on Tuesday, and the DVR didn’t record one yesterday.
I immediately thought monarch butterflies for Monday’s FJ. There’s media coverage every year when they migrate through - a local TV station had a story about them showing up now on their way to Mexico just the other day. One thing did give me pause, though. They specifically mentioned ‘around 2010’ for the year of the license plates. They don’t usually throw in details like that without a reason, so I thought that might indicate the year of a local swarm of seventeen-year locusts/cicadas.
What a bonehead move by Shouty Middle Guy on Tuesday’s game? Why in the name of Og would you bet everything with one clue left? And he didn’t even have a guess.
IIRC, he had also gotten his last few responses wrong. He was definitely on a downhill slope and accelerating fast.
As an aside, has anybody else noticed that annoying buzz in the background on Wheel of Fortune? Is it something that’s popped up just recently, and what could be causing it? 
It’s the sound of two electronic timers going off backstage, on elderly-looking portraits of Pat Sajak and Vanna White.
Damn, people actually still watch that show!? Actually, let me rephrase: Damn, people actually still watch broadcast television!?