It's Bicycle Repair Man

Nothing to do with the business, more Monty Python.
Having only ever replaced one inner tube before today I've now replaced one and taken off four more to make sure the valve was positioned correctly. Fortunately I had a good set of tyre irons. Mainly because I'd leant them to Mrs CH a couple of years ago.
I tested all the bikes I worked on and only this one caused me any pain when I came off it.