Helping others and being polite seem to be fading into oblivion. I am amazed at how few people look behind themselves to see if someone is following them through a door. I was taught to make sure to hold the door for the person behind you. Even more amazing is how few people say thank you when you hold the door for them!
Regarding oysters and snails, I like both. If you don't try new things, you never know what you might be missing!