[!] This thing is really insane. [Steps] First, make yourself a super fast redstone clock. (Find the ways on youtube by yourself.) Second, connect a command block to the power output. Third, type in the command down below: /execute @e[type=Snowball] ~ ~ ~ /summon Snowball ~ ~ ~ This will cause a infinite amount of snowballs in your screen that crashes your world. Great for trolling friends.
I would suggest not making this on the server because if I remember correctly, redstone clocks are warnable and server/world crashing I'm sure wouldn't be acceptable.
Command blocks are disabled in creative And redstone clocks, lava, etc. Llag causers are warn able and will be removed