Ha, ha!
Reminds me of the day I wrote a BASIC loop to poke random stuff into 8-bit memory going from 0x0000 to 0xFFFF. Evidently the whole machine crashed when end-of-ROM was reached at around 0x8000 and then my Mom sent me to bed. I could not ascertain whether I had damaged the machine for good, my Dad (nominally working "in computers" for some EC outfit) couldn't tell me one way or the other, and I was shitting bricks the whole day because I would really have gotten it after having destroyed "the expensive electrical device". Successful boot-up come the evening however empirically demonstrated that ROM cannot be overwritten...