Once upon a time the random function could be faked.
Because in the old interface the line length and font was fixed you could make a macro that looked like a roll. Or so I am told.
using /ran to determine the scope of the subsequent roll prevented this.
I know people who roll 3 333 and 0 1000. Anything will do it is not even server specific, it is down to guilds and groups.
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Wherever I go - there I am.