Why Do You Need a Fire Extinguisher or a Smoke Detector?

I have functioning smoke detectors in my house and two, count 'em, two well-maintained fire extinguishers in my kitchen. One's a backup in case the other fails.  But of course I don't need any of this stuff since if a fire broke out in the middle of the night I would certainly wake up in time to call the fire department.

Smoke detector