After a couple of minutes (at which point I am starting to get rather annoyed with this wannabe comedian) I tell him that I "really do not have time to listen to you, I have a train to catch". I am polite but firm, but my words fall on deaf ears. Then he changes tack...
Tramp: "Do you know any jokes?"
Chris: "Sorry mate, really got to rush for the train"
Tramp: "Come on, tell me a joke"
Chris: (becoming increasingly frustrated) "what do you call a tramp that doesn't take a hint?"
Tramp: (sucked in due to intoxication) "dunno, what do call a tramp that doesn't take a hint?"
Chris: "Sorry mate, what's your name?"
Tramps, street vendors, members of religious sects and fat people obstructing entrances take note.
If you cross Chris when he's in a hurry, you do so at your peril!