Creating eye-catching "sassy" light effects in Cinema 4D involves a few key techniques. Volumetric lighting, or "Visible Light," is the most common method, achieved by adjusting a light's properties to make its beam visible with customizable color, brightness, and noise. For more abstract or stylized effects, you can use MoGraph Cloners with Random Effectors to create a beam from scattered glowing shapes. Lastly, using Splines with a Sweep object allows for precise, controlled light streaks. To elevate the final look, always incorporate post-processing effects like Glow, Bloom, and Motion Blur to make the lights truly pop.