Joe Biden poses with swatter after fly lands on Mike Pence's head

After a fly that landed on Mike Pence's head during the Vice Presidential debate inadvertently became a meme, Joe Biden has joined in the mockery by posing with a fly swatter in a new Twitter post.

The trouble began towards the end of the debate, when a housefly was caught on camera buzzing around Pence, before landing and resting on top of his head.

Watch the moment the fly landed on Pence's head in the video below: 

The sheer visibility of the insect meant that it was the most memorable part of the night for many, and in no time whatsoever, social media users were lampooning the incident with image macros.

Not wanting to be left out of the fun, the former Vice President took to Twitter, sharing an image of himself with his 10 million followers. The picture shows Biden playfully holding a flyswatter, along with a link to the donation page of his campaign, which he captioned: "Pitch in $5 to help this campaign fly. [sic]"

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The image obviously struck a chord with the Democrat candidate's supporters, and many of them shared their reactions in the comment section of Biden's post.

Not long after this, Biden also shared a link to some brand-new merchandise available from the online store of his campaign website. The so-called "Truth Over Flies" fly-swatter cost $10.00, with every cent going to fund Biden's campaign.

Sadly for those looking to purchase one, stocks of the satirical product have already sold out.

However, it wasn't just Democrats who found the fly incident amusing, as a number of conservative commentators also seemed to appreciate the moment. For instance, former senior White House adviser Kellyanne Conway wrote to her 3.4 million followers "Give that fly a mail-in ballot." Meanwhile, Republican Senator Rand Paul added: "The deep state planted a bug on @VP. The illegal spying is really out of control."

Per BBC News, the phrase "the fly" has been tweeted and retweeted more than 700,000 times since last night's debate. However, according to the New York Post, a similar instance has already occurred back in 2016, when a fly landed on the face of Hilary Clinton during a presidential debate, and again the same year when a fly landed on Donald Trump's hair while he was on the campaign trail.