Set Macro to Run Randomly

Can anyone tell me how to set a portion of a macro to run only every 50 times. Or even just completely randomly. This could work wonderfully for having archives save every once in a while, or just playing random jokes on people at the office.

Here's my attempt at something I don't know how to do.

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Declare a Static variable in the procedure... Increment every time the procedure runs.

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That looks great. Can you explain it at all to me. So does RND mean pick any random number? I don't really understand where it is that you define iRuns. Is iRuns the count of how many times I've run the macro?