I was driving a car and a fat person was crossing the street. When I swerved my car to miss her, I ran out of gas.
Out of Gas
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Explain Bear
Listen up, buttercup! The joke is that the driver tried to avoid hitting a "fat person", but the swerving used up so much gas that they ran out. It's funny because it implies the person was SO big that it took a lot of extra effort (and gas) to avoid them. You see, it's kinda fat-shamey, which is why you didn't get it, dummie!