Long before the days of auto-correct, we urgently needed about four inches of two inch brass bar, but, as it would be a 'new batch', we would also need a test piece (and a spare, if it all went wrong), so we decided we would get a whole metre. The 'new girl' was told to type out the order and it was sent off.
Two days later, the delivery driver arrived, "Where do you want this brass bar?" - "Oh, just leave it here, under my desk." - Blank Look - "What's the problem?" - "There's two lorry-loads outside..."
"She" had missed one of the ms when typing 1000mm and we had a kilometre of bar arrive, too heavy for one truck....