Had a friend bring a store bought dutch chocolate cake over for Friendsgiving with about 10 people one year. He cut the first piece at a reasonable size, everyone else followed suit, and by the time everyone got theirs about half the cake was left. By that time the friend had finished his piece, politely asked if anyone else wanted anymore (meanwhile we're all two bites in to ours), and after everyone said no, he pulls the cake container in front of him and then proceeds to eat the entire second half of the cake in about the time it took for me to eat my one slice!