Initially, they weren't interested in meeting each other - but they hit it off right away

Bill Gates and Warren Buffett are the second and third-wealthiest people on the planet. They also happen to be best friends.

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But when they met 27 years ago, it was grudgingly. Each one was surprised at how much they enjoyed talking to the other

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Since then, they've been a tag team on political and philanthropic causes as well as mutual mentors. Plus, they love goofing off together

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Warren Buffett, 87, is the third-richest person in the world. He's a legendary investor and the CEO of Berkshire Hathaway

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Gates' mother, Mary, had invited the late Meg Greenfield, a Washington Post editor, to her home

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In fact, in 2014, Buffett donated more than $2.1 billion to the Bill and Melinda Gates Foundation

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That same year, Gates and Buffett, along with Sheldon Adelson, published a New York Times op-ed pushing for immigration reform

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