My least favourite is being asked to contact OW partners at airports where there aren't any (I can see I'm not alone in this)

My favourites have been:

SRB doing the end of flight announcement after the VS flight I was on from HKG-LHR when I was seated 2 seats away from him. Unfortunately only the UC cabin pax knew it was him as he didn't announce his name..

Being told the police were boarding on BA at LHR after a disruptive pax incident I was a witness to (again HKG-LHR bizarrely!)... not because I wanted to see the police, but because there were 2 women in the F cabin with me who got so excited about seeing the police in uniform with their guns, they nearly wet themselves !!