While this isn't normally an issue for regular Joes like you and I, Cena had signed a contract when he applied to buy one of the very rare, unbelievably exclusive new Ford GT, which stated he couldn't sell it for two years.
When supercar makers deliver a new rare and expensive model to the market - like the McLaren P1 or Ferrari LaFerrari - they go to a lot of trouble to ensure buyers are real aficionados who will love and cherish their new auto.
The WWE wrestling superstar and avid vehicle collector bought the GT in September for $463 376 (R6.34-million) but resold it shortly afterwards despite signing a purchase agreement that he'd hang onto it for at least two years.
However, by selling the 482kW supercar less than a month after taking delivery, the wrestler lost Ford nearly "two years of ambassadorship and brand value", claims the automaker. But it's all gone a bit Pete Tong.
In a lawsuit filed recently, Ford Motor Company alleges Cena broke the contract and flipped his few-weeks old GT - which carries an MSRP north of $450,000 - for a large profit.
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It seems Cena took delivery of his vehicle in September, but sold it just a month later for an undisclosed - and we must assume fairly significant - profit.
Ford will ultimately need to set out the amount of damages it wants to claim back from Cena, and according to an analysis on Road & Track, that might not be so easy.
Cena claims he wanted to sort this out with Ford, and that he sold the auto to fund expenses.
Buyers who showed brand loyalty or would likely make their ownership well-known - that is, show off the vehicle - were given preference, which made Cena, who owns a 2006 GT, a ideal applicant. Despite an annual income from wrestling alone of around £6 million.