fire burning

I walk into my room.

*sniff*

"What the hell is burning?" 
"Dad!"

"What?"

"Come in here!"

"Why?"

"Something's burning!"

He grudgingly walks in with Luke behind him, and they start sniffing.

"Do you have the oven on?"

No.

Is it the AC?
The dryer?
The hot water heater?
The fan?
Anything plugged in?

No. No.

"Well, I don't know what it is, so I guess we just have to wait for flames to see what it is."

They walk out.

Nice...