Traffic chaos as torrential rains bring capital to a standstill

The video consists of a brief interaction where the speaker greets and then bids farewell.

What do you think the expression 'Oh, I say.' conveys in a conversation?

How do you interpret the tone of the phrase 'Oh, I say.'?

Can you provide an example of a situation where 'Oh, I say.' might be used?

In what context might someone say 'Bye bye.'?

What emotions could be associated with saying 'Bye bye.'?