What is the worst way you can mess with someone?

Take them out drinking, tell them to dress fancy, like a suit or a ball gown. Get them very drunk until they pass out. Once they do, use their fingerprint to unlock their phone. Buy a one-way plane ticket to Puerto Rico from their bank account then empty the rest. Drive them to the airport and give the security guy and gate agent your sob story about how they’re getting married tomorrow in Puerto Rico and please, please, PLEASE help them! Pay for whatever is needed with their credit cards and then take the cards.

If there’s time, you can also pay a prostitute to shave their pubes. Put those in an envelope and mail them to the person’s husband/wife/boyfriend/whatever.