More often than not, associated with the realization of something that leads to Cross-Popping Veins, Luminescent Blush, Blank White Eyes, Color Failure, or the like. Beam of Enlightenment is a similar idea, but used differently. Idea Bulb is also similar. One common variation (often found in video games) is a ! rather than a random flash of light. There's also the "little crown" variation, most seen in anime. Compare Confused Question Mark. Examples of Alertness Blink include: