Occasionally, I get a really good question. Usually this involves creating a sample application, or UI. I generally like these.
Now, there are about a thousand questions that have been super silly and a waste of time. I find that most of the time, these questions take you so far out of your element that they are useless.
The best interviews I have ever had went something like this: Interviewer: "Hey, you don't need to do a technical interview because I reviewed your code and it rocks" Me: "Cool!"