My unintentional creation of a blood clot during physics simulation testing. I was programming a blood cell flow simulator in Unity3D for a Medikidz game about haemophilia, and when I cranked up the particle count to stress-test the physics, the red blood cells started clumping around a vessel wall junction. I'd accidentally simulated a thrombus. My medical training said "that's a blood clot" before my programmer brain could say "that's a bug". We kept it as a feature.
Originally posted on Instagram.