"Are you sad we didn't get a limo?" -- Slate writer David Amsden's 3-part report from a high school prom in Rockville, MD he attended, semi-incognito, a few weeks ago. It's both much tamer and just as sleazy as you might imagine at today's high school social event of the year...but mostly it will just make you glad your prom is a decade or more in your past. Don't go back to Rockville, indeed...