Grey's Anatomy, Season 15

Meredith (voice over):
When we're in love, the prefrontal cortex, where we make most of our good, rational decisions, goes into sleep mode. And the amygdala, which activates our threat response defenses, calls in sick, which leaves us pretty vulnerable to take more risk. And left alone without our normal neurological protections, we might find ourselves in dangerous and unexpected places we normally wouldn't dream of going.