Martin Lewis called it "unbelievable - it's one of the biggest success stories I've ever had" after one viewer said she'd got a massive sum after watching his show.
And it was won back by grandmother Jill.
Three months ago she realised she might have a claim while watching The Martin Lewis Money Show on ITV - and it's fair to say it worked out.
"That amount of money is... just incredible," Jill said.
Jill, 77, married husband Robin 20 years ago. Sadly, he was diagnosed with cancer two years later and died in 2008.
"At the time Robin died I got a very basic state pension," Jill said.
But she didn't realise that she had a claim on her husband's pensions too until she saw Martin's show 12 years later.
So Gill wrote to the pension office.
"Much to my surprise I had a telephone call from a young lady, who said, in fact, I had been underpaid."
How much by? She was due £82,100 back.
"I just couldn't get it into my head, it was astounding," Jill said.
"I think it'll be a good Christmas for the family, my grandchildren as well as my children."
And Jill's not alone.
Martin said: "This is hundreds of thousands of women who could be missing out on thousands of pounds on the state pension."
The reason is that married women who hit state pension age before April 2016 should get a minimum of 60% of their husband's state pension amount.
And if you've been underpaid you can get it backdated based on when your husband turned 65.
If it was after March 2008 and you missed out, you can backdate it all the way back to then.
"With £82,000 at stake, it's worth spending time on," Martin said.
But that's not the only pension payout that's possible.
He pointed out there's a campaign by former pensions minister Steve Webb campaign to get thousands as much as £80.45 a week on their psnison.
It applies to women who are now divorced or widowed or whose husbands are 65 or more who reached state pension age before 6 April 2016.
When people have learnt they can claim, some have received more than £5,000 back as a result - as well as seeing their weekly payouts boosted from that point on.
They're missing cash they're due thanks to the way the old system worked.
This saw married women pay less national insurance than their husbands - the so-called "married women's stamp" - but be entitled payouts worth 60% of what their other half got in retirement.
But they had to claim it themselves.
Women over the age of 80 can also get their payouts boosted to this level, if they pass a simple residency test.
Martin added that women and men aged over 80, can also get a top up.
If you're being paid less than £80 a week, you can get a boost up to this amount - and this is also backdateable until when you turned 80.
"Get in touch with the Government pension service to see if you're missing out," he said.
