"Going/been anywhere nice recently" is a pretty good one in the UK - most people have some kind of holiday and I don't follow football and my interest in cars is probably limited to my occasional bouts of incandescent rage at people not signalling correctly on roundabouts...
In the US I was taught you don’t need to signal at roundabouts. Am I doing something terribly wrong?
>Signal when you change lanes or exit the roundabout.
California Driver Handbook
https://www.dmv.ca.gov/web/eng_pdf/dl600.pdf
The UK version:
https://www.highwaycodeuk.co.uk/roundabouts.html
I think the main difference is the expectation that you start signalling, if appropriate, before joining the roundabout. My main complaint (OK one of my main complaints) is that drivers turning right start signalling right and then forget to signal left as they leave...
Roundabouts are a one way road, you don´t need to signal when driving on it. But you do need to indicate when you are leaving the roundabout.
Might be a regionalism, but here in Oregon, we don't signal going in, but signal right before we intend to exit. That way the next incoming driver can enter the roundabout and keep traffic flowing. We have a LOT of roundabouts though, like dozens upon dozens, and many of them are over saturated. It may be a local response to the traffic patterns here, not sure.
The most important thing is for everyone to speak the same protocol, provided that the protocol meets some minimum standard of fitness-for-purpose. But… yeah, I think you're doing it wrong.