Mobile’s reputation as the birthplace of Mardi Gras in North America does not rest solely on the fact that a few half-starved French colonists observed the pre-Lenten feasts here 300 years ago… In 1852, a group of Mobile "Cowbellians" moved to New Orleans and formed the Krewe of Comus, which is now that larger city’s oldest and most secretive Carnival society.…All of Mobile’s parading societies throw Moon Pies along with beads and doubloons, providing sugary nourishment to the revelers lining the streets.The crowd is very regional, mostly coastal Alabamians. Everyone seems to know each other, and they are always honored and often extra hospitable when they learn that you traveled a long way just to visit *their* Carnival. Late into the evening, silk-gowned debutantes with their white-tie and tail clad escorts who’ve grown weary of their formal balls blend easily with the street crowds…