It was an unbelievable moment in US history. This video of Joe Biden is going viral on social media. The crowd can be heard hurling abuses at the US President, Joe Biden. Elon Musk even tweeted the video, with the caption 'Heard 'f Biden' during one of Biden's speeches,' leaving Biden visibly confused. The video was recorded on September 23. However, many on Twitter said that the people there did not chant the 'F' word