When I leave the car at home and walk to the school, I am often caught up by another mum and we have a nice little gossip on the way.
BUT if her phone rings she always, always answers it and it is getting on my bloody nerves now.
This morning: 'Oooh,' she says, 'I'll just get this,' and strolls along the road chattering to her mum. Not about anything important - the weather, what the children had in their lunchboxes, blah, blah blah. All. The. Way. Back.
I don't care if she wants to talk to her mum (or her partner or all those other people in her family who constantly ring her) but I don't want to be ignored in the meantime. 
So, as she isn't the only rude bastard person I know who does this, what are the new social rules regarding phones?
And would I BU if, next time she tries to chat, I whip out my ipod and say, 'Ooooh, 'scuse me,' and listen to Muse all the way home? Matching my speed to hers so she can't get away without be rude? Would I? WOULD I?