There's a fire drill in my head

On arriving at work this morning, JJ announced "There's a fire drill in my head."

Me "What?"

JJ "A fire drill. Inside my head."

Me "uh...do you mean you hear a ringing like the fire drill?"
JJ "Yeah, inside my head. "

Poor kid - sinus headaches suck! But I got to hand it to him - only JJ would think to describe it as a fire drill inside his head! :)