..on the No 91 bus.
There was a tube strike while we were in London and the first 91 bus was packed so tight the driver didn't even open the doors. Just as we were considering what to do, out of nowhere it seemed swayed a vintage London bus with 'No 91 Special Service' on the front and a large avuncular conductor leaning off the back of it waving us all on with a big smile..
It still makes me smile.