A lot of times... Skin/eyes: experimenting with high-brightness LEDs. These can become pretty hot in no-time. I was trying to do my own LED driver (regulating

A lot of times... Skin/eyes: experimenting with high-brightness LEDs. These can become pretty hot in no-time. I was trying to do my own LED driver (regulating a PWM signal from voltage/current sensing), on an LED without heatsink. Because of buggy code, it started to burn my table, and by reflex I tried to pull it up with my hand.... Not to mention the countless times a white spot remained in my vision for hours, after looking at such bright LEDs (buggy PWM signal regulation algorithm that kept going from dim to super bright randomly). Ears: every time I write a driver for an amplifier/DAC with headphones output. No matter how many precautions I take. It is going to happen anyway (wrong register configuration, the default volume was too loud, etc.). Also while listening to mic recordings done with a buggy/incomplete software.