To commemorate a past event, you kill and eat an animal. It's a ritual sacrifice, with pie.
Anya ,'Sleeper'
Natter 26: Dark Natter
Off-topic discussion. Wanna talk about corsets, duct tape, or physics? This is the place. This is also a world-wide Spoiler-Free Zone. Please don't discuss what's aired this season; use the show discussion threads for that.