"With regret...you're fired!" Tonight's Apprentice had lots of opportunities for introducing ratio when the 2 teams had to create a new beer. Evolve's inept calculations led to 2 barrels of beer being poured down the drain, because of an incorrect proportion of alcohol.. Or to paraphrase Surralan.."you couldn't organise a drink in a pub"..
If you are interested in the history of measurement then Warwick Cairns' book - About the Size of it - is excellent. This short video clip gives a balanced view of the pros and cons of each measuring system. I regularly use it to introduce lessons on metric to imperial conversions: