"Please Do Not Touch Or Distract Me. I Am Working."

A chap got off the Tube this morning accompanied by a guide dog. The dog had a large notice attached to its harness bearing the message "Please do not touch or distract me. I am working."  After one awkward incident years ago*, I always leave them in peace to get on with it (I think that the chap was perfectly sighted and was training the dog rather than being blind himself, but the dog isn't supposed to know that) but I was sorely tempted to congratulate him for the most excellent sign.  * I was walking along the pavement towards a lady who was waiting patiently for her guide dog to make up its mind to cross a road. Only it wasn't a road, it was just somebody's driveway that was wide enough to look like a road.  "You'll be all right," I said helpfully, "It's not a road, it's just somebody's drive which looks like a road." The lady looked up at me and gave me a very black look. She was of course a sighted guide dog trainer and the last thing she wanted was for her careful training to be ruined by well-meaning members of the public.