Patrick Lu happened to be biking home when he spotted a couple in the middle of a proposal on the lawn of the Austin, Texas, capital building. So, Lu pulled out his camera and caught the moment. 

Joel Bush was looking for a quiet place to propose to his girlfriend.  He never thought in a million years that someone would be around to take a photograph of it, let alone a photographer.

Imagine having a picture of the exact moment of your proposal.  Neither person had a clue it was happening, so it was totally off the cuff.  What a momento to cherish!