d ) gurgled happily, sounding much like they were saying :

'On leaving the train, please ensure you have all your personal
possessions with you.'

Has no effect on the terminally scatter-brained AFAICT...

But would have an effect on someone who isn't scatter-brained, but has
left something behind.

If they're still on the train, then they don't realise that they're about
to leave something behind.

If they've just left the train, then by the time they DO realise, the train
doors are closed and the train is just disappearing into the tunnel...