Someone upscaled a picture of a DPRK soldier and it crashed their computer in the process, then they uploaded the corrupted image here to "see what would happen" and it crashed the server and put the image processing process in a loop of crashing, starting, and crashing again until it was manually shut off, IIRC.

AFAIK it led to safeguards against that sort of thing being implemented, but I don't know anything about that.