Server crash exploit?

Anyone got that?

1.Make a simple Redstone machine or something and crash it, its not too difficult
Other option:
2.Send a DDoS attack and take down the server
Other option:
3.Get Creative and crash it with spawning Mass items with large names and colors
Other option:
4.Send a keylogger to the admin or a mod, Grab passwords and give you permissions in your alts or accounts and have fun