Are both sentences OK? Or what would you say?

"while talking about something, then talking about something completely different"

If I say;
I don't understand how this got here.
I don't understand how we got here.

Question

Are both sentences OK? Or what would you say?

"while talking about something, then talking about something completely different"

If I say;
I don't understand how this got here.
I don't understand how we got here.

Answer

The second one sounds more natural. I have never heard the first one used in this context.

Answer

If you wanted to change the topic of conversation you could say/we say: Changing the subject, or... On a different subject.

If the subject had changed midcourse  and you don't understand how it happened, you could ask: How did we end up talking about this/talking about ...(mention the name of the topic)?

You could also say: How did we end up talking about ....?

I hope this helps you. 😀

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