Humerus?

       My funny-bone was twice assaulted.  We had business in Cockermouth but Pilot & Navigator decided to make a day of it and after a ubiquitous "Allday Breakfast" instead of homeward we headed for Maryport where these two events attacked.
       Event 1. After marking innumerable containers in Sellafield Labs as "MT" I was a bit amused to find another MT 1 in Maryport Harbour. 
       Event 2. I had to cheat a little.  Since the "free Me" has no extras I too one of the Warning signs and rendered it legible at a distance.
       It obviously works - we sat outside each with an Icecream Cone and slowly enjoyed then - unmolested.