Here is a good one:
Person joined the game!
Me: Welcome!
Person: May you give me op for a sec?
Me: The only time you get op is if you are staff..
Person: Please? Just give it to me for one second.
Me: I said no. If you want op, you gotta work for it.
Person: I don't care, give it to me now or I'm gonna ddos the server.
Me: OH! I'm so scared!
*Actually ddoses the server for one minute*
Me: Was that really necessary?
Person: Yes, and I'll do it to your account if you don't give me op.
*I think about it, and see what he is gonna do with it (if he deops me, I can reop myself)*
Me: Ok, I'll give you op. *Ops hims...for 1 second =p*
*Person deops me thinking he'll get away with it*
*I deop him then reop myself*
Me: ...
Person: Can you reop me?