Here is also another prank.
Forge an official letter from some government-type (earl, duke, ...etc...) to the victim demanding their presence at their court at some time some day soon. They will attend only to be turned away. Later, forge another letter from the same person demanding their presence at the next meeting of the court since they didn't attend the last one. They will be turned away again. Finally, forge another letter telling them there is an official warrant out for their arrest due to their refusal to appear at the court. Sit back and watch 'em sweat.
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