Person A wants to ruin person B's day. So person A plants rumors that person B has been bribed, and gets some random shady person to send a reasonably large amount to person B.
There's a $250 weekly limit with new accounts, and if you want to send more you must submit your name, date of birth, and the last 4 of your social. After that it goes up to only $2,500, so I doubt random shady people will depositing large amounts to anyone's account via Square Cash.
