Abigail!
Sirius was having a grand time, sitting by himself in the Leaky Cauldron, eating crackers. He probably should've been at his pub, checking in on Bess and Fabian but he really just didn't feel like going into work today. So he'd decided to bother Tom, the barkeep and see what kind of free food he could talk people into buying for him. He could afford it, of course, it just tasted better when it was free. Currently he was waiting on some soup this elderly witch had just ordered and paid for, because he 'looked too thin' and Sirius had thanked her kindly and went back to seeing how many crackers he could fit in his mouth at once.

Right now he was trying to create a new sport of cracker aerobatics, by flipping bits of cracker into his mouth using various utensils and minimal wandless magic. He managed to catch one in the back of his throat as a very familiar pair of legs walked by. Sirius coughed and choked on his cracker bit loud enough to get her attention. He polished off a mug of butterbeer to get the dryness gone, before calling out to her, "Abigail, there's a seat for you right here, luv."