Ideas for revenge on a bank?

[CrazyEyez]

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The optimal prank would:
1. Cost them lots of money
2. Affect the non-grunt workers (if I drop a deuce in the lobby, it will just screw the janitor)
3. Allow me to take full credit for it (like they KNOW it was me, but can't do anything about it)

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Sounds like this fits your criteria.