Who decides who makes the announcements?
On some recent flights with a large UK-based airline we got the usual introduction/route/height etc announcements from the FO in both cases. On another airline it was the captain both times, and I've had cases of captain out, FO back and vice versa.
So who decides, and how?
Company procedure?
Rock-paper-scissors/coin toss?
Mutual agreement as to who has the better microphone voice?
Captain pulls rank?
This is intentionally light-hearted but I'd be curious to see how this gets resolved.