Given how good deepfakes are now, how long before we have a video released to the major news outlets of the world of a world leader saying something very dangerous and scary. i.e. Putin could announce an all-out invasion of the US, Biden could announce aliens have landed and are here to exterminate us, etc. etc.
It could be something more benign like the NASDAQ has gone into a catastrophic dive never before seen, or that Tesla have been found to be breaking too many laws and are being shutdown effective immediately. (That might be a good way for the shorts to profit...)
I think it's literally a matter of months until it happens... and from that day forward we will never again be able to trust any video or audio recording. Ever.