My 7-year-old girl was at a birthday party at a large arcade, and quickly identified several vulnerabilities in a ticket game. She fully exploited them and came home with a ridiculous amount of loot. She was limited only by how fast tickets could be dispensed, so she ran four machines simultaneously. She thought nothing of this and figured anyone would have done what she did. I look forward to having her (occasionally!) work with me in 13 years or so.