Tuesday's episode of "Family Feud" featured the biggest collapse in the show's HISTORY.

It happened at the end, when the family that won was doing the speed round. Which is where two of the players have to answer the same five questions, and get a total of 200 points.

And their first player did an amazing job and got 182 of them. Meaning the second player....a woman named Anna...only needed 18. But unfortunately, all five of her answers were so bad, she got ZERO points, and missed out on $20,000.

The first question starts at :18. And there's a lower-quality version of the entire, unedited segment here.