You were 6 rofls off from my second highest record. It was 86, which was also on Nether. If you're wondering why it's 6, it's because in the ol' days rofls used to start at 1, not 4. Rofls didn't count the kills before the actual rofls. Getting 100 rofls is practically impossible now. There's not enough people on anymore which prevents there to be enough zombies to get 100 rofls in the amount of time.