EXCLUSIVE: Chris Harrison Reveals 'The Bachelor' Moment He Considers Most Cringeworthy

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The Bachelor has seen its fair share of awkwardness, but ET found out which moment host Chris Harrison found to be the most difficult to watch.

Longtime fans of the show are familiar with the moment season 13 Bachelor Jason Mesnick's last name became synonymous with a man having an emotional breakdown, and Harrison told ET that Mesnick's cryfest tops his list of the most cringe-worthy moments to ever air on the show.

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"It's called a Mesnick for a reason, so that's got to be No. 1, right?" Harrison said.

The breakdown came as a result of Mesnick's heart being torn between two women. The reality star initially picked Melissa Rycroft, but during the After the Final Rose show dumped her and chose Molly Malaney.

"I knew that Jason and Melissa had broken up essentially, but then I also knew he wanted to have a chance to at least talk to Molly," Harrison explained. "We thought, why not sit them down and let them speak?"

Jason and Molly tied the knot in 2010 and remain married to this day.

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A close runner-up for Harrison in terms of cringe-worthy moments, was Jake Pavelka and Vienna Girardi's squabble.

"The Jake and Vienna breakup just exploded," Harrison said.

Jake and Vienna became engaged after season 14 of The Bachelor but eventually split. Tensions came to a head when they were invited back to the show for a post-split interview.

"Some word got out that Jake had looked violent or made a fist, so we said, 'Well, now we have to air it, because everybody is going to talk about this and thinks we're hiding something,'" Harrison said. "It was very raw."

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Honorable mention goes to season 18 Bachelor, Juan Pablo Gavaris, but not for anything specific. Harrison said the whole season was pretty rough.

"He gave them a lot of reasons to [hate him]," Harrison said.