Say please. Keep your shoelaces tied. Wash your hands. Don't tell lies. Buckle up.
Don't go swimming for 30 minutes after you eat. Respect your elders. Don't steal.
These are important lessons we all learn early on in life. And as we go into adulthood, we take these lessons with us.
But there are some things our parents and teachers don't explicitly warn us about. And we have to learn those lessons the hard way.
For example, don't propose in public unless you're pretty sure she'll say yes. And don't propose in a mall food court unless you're pretty sure she's blind and deaf and can't tell where you are.