For checking the transcript: https://www.buzzsprout.com/2379282
Wake-up call
is a shocking or serious event that forces people to recognize a problem and take action.

Examples:
1- The wildfires in California last year were a wake-up call for governments to take action on climate change and improve emergency preparedness.
2- For John, his heart attack was a wake-up call to start eating healthier and exercising regularly.