..oh this reminds me of a similar experience, some years ago when this type of behaviour was thankfully unusual...
Was on a train going to a job interview so had splurged on 1st class to get some peace and quiet for preparation.
Unfortunately as I try to read my notes, a couple of loud wannabe 'bruvs' and girlfriend board and enter the quiet carriage, sitting on the row in front of me.
One of them has a particularly big gob, and is keen to tell his mate and girlfriend how big he is, that he is going to buy some drugs etc. (Calpol perhaps?) The carriage, of mostly businessmen, are suitably held captive enthralled by his grandiose gangsta comments.
Then he switches some music on... It is the most god-awful shit I have ever heard in my life, of course at loud volume. After a moment, his girlfriend hesitantly asks if he could 'er, turn it down a bit', clearly having better musical taste than him. He earnestly replies, 'I can't, my music is my life, man'. Glancing around I see several people trying to stifle guffaws at this, and think, well you haven't really got much to live for have you.
The conversation turns to the fact that they are in the wrong carriage, not having bought 1st class tickets, and what they will do if an inspector gets on. Both boys assure the world at large that they will punch any inspector that dares to tell them off.
Well with the most beautiful timing, 2 stops later the doors open and a large, no-nonsense female Valkyrie of an inspector boards the train. I sense a rapid deflation of egos in the row in front, and the radio is suddenly turned off. I am impressed, this woman has commanding presence and serious authority.
Inspector Brynhilda booms, 'ANYONE on this carriage with the wrong ticket, will leave NOW or there. will. be. trouble'. At this, big gob and his cronies leap up and take the scuttle of shame down the aisle like scared little mice, trying to avoid making eye-contact with anyone on the carriage.. along with his little Fisher Price radio. Bless. Bye. bye.
Blissful peace for the rest of the journey.
We need matrons like this in hospitals again.