The Thunderbird entered production for the 1955 model year as a sporty two-seat convertible. Unlike the Chevrolet Corvette, it was not marketed as a sports car. Ford positioned the Thunderbird as an upscale model and is credited in developing a new market segment, the personal luxury car.
When you have excess air in your stomach, it usually comes out as a burp. Usually the burp will have a smell of the food that you ate, but sometimes it will come out smelling like rotten eggs. This is a condition that is known as sulfur burp, and they can be very embarrassing and unpleasant, especially if they happen in the presence of others.
No matter where it's coming from, the rotten-egg smell usually associated with sulfur is an unpleasant one, and it usually means something is wrong. The smell may actually be caused by a sulfur compound, such as hydrogen sulfide -- which originates in fetid swamps and sewer pipes -- or sulfur dioxide -- a byproduct of fossil fuel combustion.