Just my two cents @Kevin Carbon 

you made me laugh.. keep in mind when I started we had this thing called carbon paper what a mess. no fax machine no computer just smudged copies.  

I do this when refinishing hardwood floors and I'm putting three coats of oil based varnish/polyurethane on them.My partners father used to "swear" that by "blowing air" (by mouth) into an open can of paint and then closing the lid quickly (replacing the oxygen in the space in the can with carbon dioxide) prevented fungus from growing in the can (some also simply place a piece of Saran wrap over the wet paint to keep it from drying out).Gail 

Chlorine dioxide. 

(Although it might be a carbon monoxide leak, CO poisoning looks a lot like a stereotypical haunting, 100% serious)

I think in Carbon or Schuylkill County, Pa. $20,000.everyone he knows says stay away.  

Quote from @John Carbone: The decline in the smokies has been felt by the bottom tier properties.

Carbon monoxide alarms are missing.

Chris makes a point that brings up a great distinction...Your local jurisdiction may require you to pull permits on things like replacing the HVAC unit, and it's never a bad idea to do so (improperly installed HVAC systems can leak carbon monoxide, which can kill people).But, in my opinion, there are a lot of things that local building departments say should be permitted, but that I will rarely permit if that's all I'm doing.

Isn't it funny when you think back to handwriting letters, sending them in the mail,  making carbon copies even, and phones with cords, not to mention party lines!