Using thermal images, you can see living things in otherwise complete darkness, check the distributions of heat in gaseous forms and even scan for diseases. You know, boring stuff.
But one redditor saw the true potential of cutting-edge thermography and decided to take his new thermal camera into the bathroom with him, resulting in a short clip that is disgusting and looks like footage of smelting ore in a volcano:
But what's most alarming about the video is the amount of discernible splash-back, showing a terrible use of angle consideration, speaking strictly of fluid dynamics.
Next time, maybe he should try sitting.