Working in the garage is slightly more dangerous than your average job. The Bureau of Labor Statistics collects workplace injury and fatality data each year, tracking trends that affect worker's health by occupation, type of injury, and demographics:
Mechanics are more likely than the average worker to be injured or killed on the job, as evidenced by higher rates of fatalities and injuries and illnesses. For both fatal and nonfatal injuries, contact with objects and equipment, such as parts and materials and vehicles, represents a significant hazard. Many of the remaining nonfatal cases are due to overexertion and sprains and strains. Assaults and violent acts are a leading cause of workplace fatalities.
That last part may come as a surprise, but it's true. The numbers tell us that two leading causes of death in the garage are “Contact with Objects or Equipment” (falling cars, for example) and assault or violent acts, evenly split between murder and suicide. In each case, the rates are nearly twice the average rate for all tracked occupations.