Hey Bobby, What's the French for Diesel?

I love Thierry Henri's Renault Ads. In true Thierry Henri fashion someone in French Class the other day said "What's the French for 'cul-de-sac'?" Which is funny enough in itself but what really had the rest of us rolling on the floor (yes we are this sad) was the English translation, which literally is "arse-end of a bag". So to all those people who think they are posh because they live in a cul-de-sac... the French are sniggering at you.