Yes the ones that come on and say can I have op are annoying

if you have creative mode then this is so fun to do..
go into a mine and dig a hole down to bedrock (and to void)
cover the top of the hole with diamond ore. so when they mine it if there standing on top of it they will fall and die =D. you can also do variations of this and make it even harder do detect (lava traps)
you can also do this on top land but then only noob's would fall for it xD

I get so angry with some of them D:
They come onto my server and are all like:
"Heyyy nice server bro can I haz OP> I a,. pro builderrt!!"

After months of Minecraft server owning, it really does get one annoyed! You get used to it eventually though!

you /nuke them

A. Troll them.
B. Dig a pit of lava with a piston trap and put a diamond in the middle.
C. Apprentice them.
D. /kill
E. Fill their inventory with cobble and tell them; "You're rich!"
The list goes on when your a CoOwner of a server.

Ruins the landscape

Dig random holes that either go to lava or bedrock.

Cookies and diamonds on a pressure plate with 4 iron doors, never fails to amaze me how many people fell for it.

I've seen that trap before

Lol Boob Traps. It's Booby Traps. I put 4 iron doors down and put a pressure plate in the middle. I put obsidian on top and put a cookie on the pressure plate and say "FREE COOKIES!" and trap some one

Yes boob traps are good

Tell them to hug a creeper.

Build a Land Mine.
Say, "Free Cookies" On a sign above 4 doors.
Make the four doors in the shape of a cage for when the noob enters. Then the noob triggers the trap, the bam TNT blows him up!
You can find the Schematic somewhere... Or ask someone...