If for some reason somebody joins late / gets kicked off, and you're watching something on youtube, youtube supports time-index URL fragments like this https://

If for some reason somebody joins late / gets kicked off, and you're watching something on youtube, youtube supports time-index URL fragments like this https://www.youtube.com/watch?v=F4-SxcCO5d0#t=3m17s https://www.youtube.com/watch?v=F4-SxcCO5d0#t=3m17s , and you could start a new watchparty with that URL. It's heavyweight and probably better to just sync by somebody shouting a timestamp, but if you need things synced there you go.