Bus stops. Dog ambles on and down the aisle. A determined amble. Pad, pad, pad, pad. "It doesn't belong to anybody!" someone exclaims. It looks quite dignified. Smooth skinned non-barking mongrel, medium sized.

"It's not mine," says a woman running after it. She holds an improvised lead. The dog does not seem willing to be captured. She offers it some of the contents of what looks like a vegetarian sandwich. "There's nothing like bribery," I comment, suppressing the thought that it the temptation for the dog if the sandwich had been laced with meat. "It's not my sandwich, It belongs to a colleague!" But it does the trick, and soon the woman is tugging back down the aisle.

God knows what the penalties are for an accompanied dog travelling without a ticket, but the driver has throughout remained passive and uninvolved. As she exits, I try to lead a round of applause for the woman who has seduced a dog she doesn't own with a sandwich that isn't hers and removed it from a bus she doesn't want to travel on - but no one else joins in.