The nanny shows always do the things mentioned in previous posts. Put them in a time out place or "naughty chair," or whatever, one minute for every year of age, and walk away. If they get up, you say nothing, just go pick them up and put them there again, and the time starts over. Each time they get up, you get them and restart the clock (doesn't have to literally be a clock you start and stop; just start the two minutes or whatever over).

Also, ignoring them while they throw a temper tantrum is good. Put some ear plugs in if you need to.

And the two choices thing is another thing I've heard. If you go for ice cream, offer him two flavors: "Do you want vanilla or chocolate?" (any flavors you want to offer).

And it's good to offer rewards for good behavior.