Having to teach 5-10 year olds I have a few ideas:

I like the computers are dumb angle, calling anything dumb will get a child's attention.

As for your "show them an actual program", I like this idea but physical examples seem to work better with kids so I'd have a prop not a computer screen or situation - one very classic example of this is as follows:

Have the children "program", on paper if you have time, you to make a peanut butter sandwich: when you get an instruction like "open the jar of peanut butter" cut open the plastic with your knife, "put peanut butter on bread" put the jar on top of the loaf of bread. Then write out, or have written out, an actual "program" for making a peanut butter sandwich (pick up peanut butter; unscrew lid;...etc). This should give a good example of AI, basic programming comcepts (add a while(PB area < bread surface){}), and just be a fun example. This was actually my first programming related school work, when I was about 10.