As a direct result of having two cars at the NEC I made the discovery that irony loses its funny side when you are the one on the receiving end of the misfortune. Let me elucidate:
An advantage of living in Birmingham is that it has excellent public transport and a bus pass which allows free travel on all buses and trains within the West Midlands after 9.30 on weekdays and all weekend. Accordingly, I had taken the Excelsior into the NEC on Wednesday morning and made my way home on two trains and was running for the bus for the last leg of the trip when I had another sort of trip causing me to make contact with the pavement in a manner which caused me superficial, but uncomfortable, body damage. I did catch the bus and it was only after I had washed the dirt of of the grazes on hands and nose and made a cuppa that the irony occurred to me: the cause of the trip was the dimples on the pavement which are there to warn blind people that they are approaching a dropped kerb.
So I had been tripped up by a safety feature!
However, since I can still see and run and am three score and ten plus, I can accept that there is a funny side to it.