"Mythbusters" will have more impact
(honestly, I watch it for the science, I didn't realise Kari was a girls name).
Watching older MB broadcasts (on Quest) I was struck by how they plugged "the science" whilst talking in feet, inches and pounds. At some point they must have had a policy shift, because I noticed the newer ones (Discovery channel) are now metric. For me, the intersting point was they don't feel the need to explain the units - so clearly there's an assumption that their core demographic is familiar enough with metric.
My Dad's from "yourup", so I grew up metric at home too ...
