It's the return of our favorite holiday-related animal costume parade of the year: yesterday was the 21st annual Tompkins Square Park Halloween Dog Parade, where dogs and humans alike dressed up as everyone from Lady Gaga (with meat dress!) to Donald Draper to Yoda. There were also plenty of topical costumes, including many Occupy Wall Street protesters and one dog who represented Hurricane Irene. And there's always room in our hearts for dogs dressed as Dave Mustane of Megadeth, and literal "poop" factories. Click through to see some highlights, and we'll have more pictures tomorrow taken by the one-and-only Katie Sokoler.