How do you know you are on a great date?

Poll - Total Votes: 15

There's no way of knowing till later?

You know it instantly.

It develops towards a great crescendo.

You may vote on multiple answers.

So... what is a great date? What is your hallmark for knowing you are on (or had) a great Date?...
Of course, context matters. Is this your first date or a blind date.... or is it celebrating a special day... Valentine's with your wife?... Lol.