Of course, not everyone sits down to a turkey dinner on Thanksgiving, and PETA and the US Postal Service are honoring a few of them with a “Vegetarian Icons” stamp sheet. There are a couple of non-meat-eating New Englanders among the VIP veggies, including New Hampshire-bred comedian Sarah Silverman and former Cambridge kid Casey Affleck. In her book, “The Bedwetter: Stories of Courage, Redemption, and Pee,” Silverman says she stopped eating meat at the age of 6 after seeing a turkey killed for food. “[I]t was horrifying,” she writes. “And though I’m probably projecting, I don’t think it was in the turkey’s top-five favorite moments, either.” Others featured on the new stamps include Paul McCartney, Pamela Anderson, Ricky Martin, and Joaquin Phoenix.