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Only 44% of U.S. adults say they have enough money saved to cover a $1,000 emergency expense, a recent found. And Shark Tank‘s Kevin O’Leary has some tough-love advice for those who want to improve their financial situations.

In a post published on social-media platform in September, the investor and judge known as “Mr. Wonderful” revealed a couple of “stupid” ways that people spend money every year, per personal finance site .

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According to the “Shark,” who boasts an estimated , people “need to stop spending money on crap [they] don’t need,” which includes buying coffee and lunch out instead of making both at home.

Stop spending money on crap you don’t need! What’s the biggest waste of money you see today?

— Kevin O’Leary aka Mr. Wonderful (@kevinolearytv)

In a video accompanying the post, O’Leary questions the decision to spend more than $5 on a coffee or $15 on lunch during the work day.

“What are you, an idiot?” O’Leary says. “It costs you 99 cents to make a sandwich at home and bring it with you. You start to add that up every day, it’s a ton of money. Most people, particularly working in metropolitan cities, are just starting out on their job, making their first $60,000, p*ss away about $15,000 a year on stupid stuff.”

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O’Leary, who’s appeared as a Shark Tank investor since the show’s 2009 debut, kicked off his business career with the launch of educational software company Softkey in 1986, per . Barbie producer Mattel purchased Softkey for $4.2 billion in 1999.