I think I may have told this one before, but....
My dad was a working for the gas board, and knocked on a door on some enquiry. When told who he worked for, the lady of the house drew his attention to a letter she had recently recieved from the gas board.
Much embarassed, he explained to the lady that the letter F is very close to the letter T on a typewriter. "I am very sorry Mrs Tucker" he concluded.
"Well that's all very well, but my name is Campbell" she replied..........
oops..

KRis