Things I might have learnt, had I not already known:
- Some things change.
- Some things just don't change.
- It's not always obvious which kind of thing a particular thing is.
- Teachers learn more from their students than the other way round.
- Old people don't necessarily understand young people...
- ... and vice versa...
- ... with certain exceptions.
- Put whales into your movie, it'll probably be more successful.