The explosion of a sprayed "canned air" container in a parked vehicle is a good example of just that!
UNRECOGNIZED HAZARDS can exist anywhere. Here are pictures of my truck. I had sprayed "canned air" (like you use to clean your keyboard) in my truck to clean the dash and overhead console. A few minutes later I rolled down my window, went to light a cigarette, and a flash explosion occurred inside the cab. Thankfully, I was alone in the truck. I had 1st and 2nd degree burns on my arms and spent 4 days in the burn center at Doctors Hospital.
Front view of truck after ignition/explosion 
Rear view of truck after ignition/explosion
Analysis: This can contains 1,1-difluoroethane. It is an extremely flammable aerosol propellant, as well as an asphyxiant if inhaled in large enough concentrations.
Actions: Use caution with compressed chemicals. Read contents very carefully. Most aerosols have flammable propellants -- even canned air.
Hazard(s): Firearms & Explosives, Personal Injury / Exposure - Airborne Materials, Personal Injury / Exposure - Hazardous Material (General), Personal Injury / Exposure - Toxic Material
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