This is true and I have to confess I didn't find it funny in at the time - takes a bit of time to tell - sorry
I used to be petrified of going to the dentist and as a result, had a lot of teeth problems when I was younger
On my first job on London I started having really bad pain - when I told my boss, he recommended me to "a very attractive young South African woman Dentist" nearby - "you'll enjoy a visit to her" he said "she's very well-built and has a habit of leaning very close over you when she examines you"
To my shame, this did much to overcome my fears, so I contacted her and made an appointment - when I explained my nervousness, she was very understanding and assured me she would render me unconscious before she did her work, if it was necessary - she told me to arrange for someone to get me home
   
At the time I was paired with an electrician who happened to be known as a practical joker, on the day I had arranged with him that I would not be in work on the day because of having to be knocked out for dental work
Earlier that week we had been working at a local farm where he had been given a frozen chicken and asked me did I want one if he could get another - a said I did

On the day, Pat agreed to pick me up from the Dentist, which she did - I was in a stupor, so when she took me home she had to lead me up the three fights of steep, winding stairs to our self-contained top floor flat - she left me slumped in a chair and returned to work
Shortly afterwards the front door ball reng and I made my way carefully down stairs and opened the front door to find there was nobody there but there was a cardboard box on the doorstep
I brought it inside, closed the front door and opened the box
A live chicken flew out   
I chased that poor bird up and down the stairs for an hour before I finally got it back into the box - when Pat got home she found chicken-shit covering the stairs from top to bottom
Jim