A third of these were surprisingly good, a third okay, the last third... problematic (usually topical or an extremely bad pun--I do like good puns).
This was my favorite (although other good ones stood out for different reasons):
"Sometimes, she reflected, a stranger is just a friend you haven't alienated yet."As a character, this one line gives incredible insight into her person and emotional state: Sharp, biting if intelligent commentary, but underlaid with sadness for something more.
Remember, like poetry, when we're talking concision, not everything will floor you. This has enough good stuff to make looking over this example of a tiny genre worthwhile.