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Serial cooterbitionist Britney Spears may have recently rediscovered the confidence enhancing pleasures of the ladies' underpanty, but it seems as though she still hasn't quite gotten out of her system all the "on the town with friends"-going (even on her birthday, y'all!) she's sacrificed over the past couple years in the name of a higher, procreational calling. TMZ's camcorder-equipped centurions were on hand to capture yet another of her nocturnal adventures, a carefree evening of baby-free fun that turned dark when a bystander at The Standard "pulled the car door open and proceeded to jump around crazily." The stunning video is here, with the googley-eyed, lunatic leaper in aqua satinware making his terrifying appearance just before the midway mark. Like a crazed Muppet out of her darkest nightmares, Britney won't soon forget his shameless mugging for the paparazzi, nor those chilling, final words of "Ay! Ay! Ay! Ay!" before he got bored and wandered away, and she courageously managed to slam shut her SUV door.