What's the best compliment you ever received from a stranger?

Somehow I will always remember the random guy in a coffee shop at university who told me "I love your style" - Yes, I had finally mastered the Fall Tumblr Girl look of 2012.

Honourable mention to the 5 year old in the park who told me I "look like a teenager" last week.

What's the best compliment a total stranger ever gave you?