Occasionally, drivers who purchase used vehicles may see the car increase in value if they keep it in mint condition and that particular model ends up becoming a classic. Yet this is usually not the most efficient way to go about purchasing a vehicle, and more often than not a car will decrease in value over time.

However, one way that a car's price will shoot up dramatically is if it's involved with a celebrity, a famous event, or better yet, both. That was the case for a 1963 Pontiac Bonneville ambulance that was recently sold at auction.

These oddly-shaped machines normally fetch around $10,000, but this model in particular was rumored to have carried John F. Kennedy's body shortly after his assassination. According to the story, the ambulance met the Kennedys at Andrews Air Force Base and carried the body to the hospital for an autopsy and later, the U.S. Capitol.

In the end, a collector shelled out $132,000 for the vehicle, although that was much less than the once-rumored $1 million price tag. That may be because the car blog Jalopnik published a story days before the auction, which claimed that the actual ambulance had been destroyed in 1986.

The auction house independently investigated, but couldn't verify either story 100 percent. Thus, the sale went ahead, although the controversy likely contributed to the much lower bid.