You're dreading the moment.
As your uncle passes the roast potatoes, he casually mentions that a coronavirus vaccine will be used to inject microchips into our bodies to track us.
Or maybe it's that point when a friend, after a couple of pints, starts talking about how Covid-19 "doesn't exist". Or when pudding is ruined as a long-lost cousin starts spinning lurid tales about QAnon and elite Satanists eating babies.
BBC Reality Check team has looked into some of the most widely shared false claims: about alleged plots to put microchips into people, the supposed re-engineering of our genetic code, and about safety.
As President Trump continues to dispute the result of the US election, false or misleading posts have been spreading on social media about the vote.
Some have been amplified by President Trump and his team, who have called into question the integrity of the election without providing evidence.
BBC's Reality Check Team has checked some of the main claims.
GO VIRAL! is a 5-minute game that helps protect you against COVID-19 misinformation. You’ll learn about some of the most common strategies used to spread false and misleading information about the virus. Understanding these tricks allows you to resist them the next time you come across them online.
Digital literacy is about understanding that just because we want something to be true, it doesn't make it true.
We need to to teach ourselves and our young people to stop, think and check before sharing untruths on social media.
There has been a number of posts on Facebook claiming that the Coronavirus Act means that children can be taken out of school without their parents’ or carers’ permission and detained for 14 days if they are suspected to have Covid-19. Others have claimed children can be detained for 14 days without informing their parents, and only a teacher needs to be informed.
For facts, not rumours, read more.
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