If there was ever a city to fall off the wagon in, it’s New Orleans. If there was ever a time, it’s Mardi Gras. While the carnival culminates tomorrow, Fat Tuesday, the Transformers actor Shia LaBeouf — who has professed to be sober, and who has blamed his abusive behavior toward ex-girlfriend FKA twigs on his past alcoholism — has been on an extended-weekend bar crawl in the city’s Uptown neighborhood since Thursday, say employees of various drinking establishments around the city. The mercurial actor ran into a door block early Sunday night at the open-24/7 bar Ms Mae’s when LaBeouf — married to Frankenstein indie queen Mia Goth, though reportedly separated — showed up at the boisterous dive sans shirt or cash. He wasn’t alone in what Ms Mae’s doorman Robert Skuse described as an “inebriated” state, and was “somewhat belligerent.” LaBeouf came in right around the time the Bacchus super-krewe parade rolled up St. Charles Avenue, amid thousands of revelers, most of them deeply in their go-cups, catching “throws” and watching floats and marching bands go by. In the middle of the mayhem, “He did the ‘Do you know who I am?’ bit,” Skuse said. Many did recognize him, asking him to pose for group Instagrams, to which he complied. “He was so nice on Thursday,” said a Ms Mae’s bartender, who served him that night. On Sunday, he put his shirt back on when told he had to. Ms Mae’s, on the corner of Napoleon and Magazine, is an old-school dive bar that welcomes its share of visiting bold-faced names with a respectful shrug. Its staff, on Sunday, asked the actor to leave after he attempted to “be a celebrity bartender.”  “He asked me three times if he could use his credit card,” said bartender Kyle Catarouch, who was working that early evening. The bar has at least 50 “Cash Only” signs. “Why don’t you go back and dig holes?” she said — a reference to the actor’s breakout movie Holes, from 2003. Having heard other anecdotes about his bar forays, said another bartender, requestin