I saw a lovely setting sun in the mirror while stuck in a horrendous traffic jam today. Decided to shoot through the wing mirror while waiting at the lights.
Deliberate under-exposure kept the bright sun in check. That, plus factors such as micro-vibrations and dust on an already optically-imperfect mirror created some funky effects.
I like the surreal effect in which different shades of red and orange dominate; that of the sun, the street lights and tail lights of cars going in the opposite direction.