1. howling at the moon
2. sleeping instead of howling at the moon
3. the fact that while we need to look up to see the moon, if we were to go stand on the moon, we would also have to look up to see Earth
4. the word "Earthrise"
5. when the good people at Star Trek realized they needed to change "where no man has gone before" to "where no one has gone before" and just did it without making a big deal about it