Here's an interesting idea, create two microwave antennas, connected by a flimsy bridge that can't support the amount of energy flowing through it, which leads to the bridge igniting. And of course, make it out of fruit.
How you do it:
Step 1: Get a nice big green grape (you can substitute a purple one if you feel the need, but green ones are seedless and easier to use). It should look something like this X.
Step 2: In the center of the grape make
a horizontal cut. Cut thru the entire grape, EXCEPT for a small
section of the skin so that you now have this
.
Step 3: Place the grape in your microwave, so that the sliced side faces either up or down, as long as it doesn't lay on its side.
Step 4: Close the microwave door, put
about 15 seconds on the timer, and press start. In 5-10 seconds you
should notice a bright light emanating from the thin skin connecting the
grape halfs. It'll start out like
this 
. Leave
it in for the full 15 seconds, it might go out and start up again.
Step 5: Point and laugh hysterically.
Step 6: Repeat steps 1-5 until it becomes boring.
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