On a train where an older woman is going over (in great detail, and to several different people over the phone) her (I presume adult) daughters current illness (including dihorrea and vomiting) and what she'll need to be doing over Xmas to help them out. Almost in a weird stealth boast way.
Add to that the volume she's "talking" (I'd say shouting) down the phone.
I don't mind people on the phone on transport in general, but Aibu to not want to know, for the 6th time and counting about her daughter shitting her innards out at great volume
Before anyone says their isn't a quiet carriage on this service.