Her opponent's constant sniffing at last debate sent viewers into a frenzy

Some likened her to a 'grandma' while others said it was proof she is 'evil'

Viewers were distracted by Clinton's stubborn smile during the debate

With her opponent dogged by accusations of sexual assault, Hillary Clinton had strong odds as she entered the third presidential debate on Wednesday.

Only one thing seemed to threaten her chances of victory: her smile.

The Democratic candidate faced a flood of insults as she took to the stage at the University of Las Vegas, with many viewers confessing they were 'creeped out' by her stubborn grin.

Hundreds took to Twitter to describe her smile as 'scary' and 'creepy'.

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Hillary Clinton's unrelenting smile at Wednesday's presidential debate made for uncomfortable viewing for some voters

Others questioned why, when being slammed with insults from her opponent, her expression did not drop.

'Hillary Clinton's smile is the scariest thing I've ever seen in my life,' said one observer.

'When Hillary smiles she looks like an evil snake,' another commented.

'What to do when you don't have a response? Smile like a chipmunk,' remarked another.

'Whoever told Hillary Clinton to smile less since the first debate gave great advice,' mused a different viewer.

Others, ever-so-slightly more charmed by her cheerful demeanor, likened her to a happy grandmother.

The Democratic candidate beamed as she listened to Donald Trump slam her political record and campaign policies

Her glee remained written all over her face as Trump continued to slate her, much to viewers' confusion

Twitter users were quick to mock her expression as they watched the debate on Wednesday

Clinton's happy expression became a talking point at earlier debates. It continued to peak viewers' interests at her final showdown with Trump on Wednesday (above)

'Hillary Clinton is so cute it's something about her I just want her to tuck me in and give me a kiss with her coffee breath,' one commented.

It was not the first time her facial expression sparked interest among voters.

After the first presidential debate on September 26, political commentators shared some free advice with the candidate online.

'Who told Hillary Clinton to keep smiling like she’s at her granddaughter’s birthday party?' said David Frum, senior editor of The Atlantic, at the time.

The discussion had the same hallmarks of bizarre criticisms made earlier this month about Donald Trump's incessant sniffing.