This one time, I parked my car at the top of my sister's driveway (when I was living with her), but I didn't set the handbrake right....
My car rolled down the driveway and straight through her garage door. It was pretty bad.

Last week I accidentally blew 1/2 the electric outlets in the RV while cooking dinner. Had too much turned on & running all at once - the lights, the microwave, my mom's convection oven, my cell phone and laptop were plugged in, the lamp outside was plugged in and turned on, and IDK what else.. Usually overloading like that will just kick the circuit breaker, but this time it completely blew that set of outlets.