The stupid error/syntax message thing has been done to death, but since you brought up arresting people... Me as a traffic cop:
me: "I'm afraid I'm going to have to confiscate your license madam."
idiot: "Why, what did I do wrong?"
me: "You haven't broken any laws madam, you're just too stupid to be allowed to drive."
And instead of drug test we should give people pre-employment IQ tests. Me as a human resource manager:
me: "You have an excellent employment history and an MBA from Harvard, but I'm afraid we hired a kid fresh out of High School instead."
idiot: "Why, what could I have done differently?"
me: "Nothing, you have an IQ of room temperature. You don't even qualify to mop the floor here."
I guess that's why I'm not a traffic cop or HR manager.