80 percent of the world's wealth is owned by the top 20 percent of people.

80 percent of a company's sales are made by 20 percent of its sales staff.

80% of a company's complaints come from 20 percent of its customers.

And my favorite one:
"Showing up is 80 percent of life." —Woody Allen

And a modern take on that:
80 percent of success is showing up... on Google.

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So next time you're thinking of skipping that job interview, meeting or exhibition, know that just by going, you're already in the top 20%.