American rapper Jack Harlow is making a star name for himself in American pop and music culture, most recently hosting Saturday Night Live last weekend. The Kentucky native is hugely popular on Instagram with about 6.8 million followers, so it's becoming more common to hear his name mentioned these days.

But even with the newfound star status and large social following, I was still caught off guard to hear Harlow's name mentioned on American Express' (NYSE: AXP) latest earnings call. Earnings calls provide the management of companies with an opportunity to update the public on how the company performed over the prior three months and also update investors on what management thinks might happen going forward.

While they can be incredibly informative meetings, they can also be pretty bland. So when Harlow's name got mentioned, it was certainly an intriguing -- yet also telling -- moment about AmEx's business. Here's why.

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Source Fool.com