This is funny, in a painful sort of way. Charles Murray at the American Enterprise Institute blog in 2009:

I’ve been marooned in Paris the last three days, waiting for a plane home after the snowstorm mess (“Poor Charles,” you’re all saying). Last night, having been struck by how polyglot Paris has become, I collected data as I walked along, counting people who looked like native French (which probably added in a few Brits and other Europeans) versus everyone else.

Oooh super-professional Data Collection there, counting the people you think look like native French,  and allowing that you may have accidentally counted a few “Brits and other Europeans” by mistake.

I can’t vouch for the representativeness of the sample,