Do Millennials have a "everyone remembers where they were when ___ happened?" Like 9-11 for X-ers or Kennedy shot for boomers?

I know how old Millennials are -- Boomers remember 9-11 as well. I don't think it's a generation-defining moment like JFK for boomers though.

Okay, okay. You all have convinced me: 9/11 for older Millennials works, and it's probably more the shuttle explosion for Xers.