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Marissa Mayer's laugh is one of those iconic sounds of American culture. Like the NBC chimes and the phrase "I'm Rick James, bitch," the nervous giggle of the Google VP forever echoes in the mind of the zeitgeist. VC Paul Kedrosky calls it "unnerving." Various Stanford students e-mailed in noting the same.

Have you missed out on the Marissa Mayer giggle? Here are two clips, pulled from her recent Stanford lecture video:

Marissa laugh #1
Marissa laugh #2

A freak of nature? A tic worthy of PR team investigation? Either way, that's just the noise you start making when you sit down and do e-mail for ten to 14 hours straight.

Marissa Mayer lecture video [Stanford]