Classically, if you weren't near any objects you could minor illusion to (no torches, chairs, etc), you could drop a coin, cast minor illusion (become the coin), pick up the coin, recast illusion.
The second cast would 'fail', as there was nothing to turn into, breaking the root effect, but you would still have the appearance of the coin.
It was a great way to have noobs chase you / have double invis.
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