Last Friday at work, I'd mentioned to a coworker how difficult it seemed to me to learn even elementary spoken Mandarin, and that I'd recently written it off as impossible after 15 tongue-twisted minutes of Pimsleur.
She disagreed and said it wasn't that hard. Then she continued - in Mandarin.
Then I remembered that half my coworkers have PhDs, and hers happened to be in linguistics. ;-)