June 13, 2016 at 12:35 PM EDT

No matter what, you should not spend $4,000 on elf-spotting school in Reykjavík, Iceland. We know it and Suze Orman knows it, but John Oliver and Billy Eichner want to make absolutely sure you know it. What you should do if you have an extra $4,000 sitting around, is save it for retirement, which was the hot topic Oliver tackled in Sunday night’s Last Week Tonight.

After explaining the series of high fees and risky pitfalls of retirement planning, Oliver enlisted Eichner, along with Kristin Chenoweth, to summarize some of the issues (seen starting at the 18:15 mark in the video below).

A few key takeaways: “If you have an advisor, ask if they’re a fiduciary. If they say no, run,” Eichner says. Also, “average people like you — and, let’s face it, you’re very, very average — should probably just invest in low-cost index funds and leave it alone. You should check on it about as often as you Google whether or not Gene Hackman is still alive.” And, if you don’t do these things, you could crush Kristin Chenoweth (and you don’t really want to crush Kristin Chenoweth).

Watch the video below.

Last Week Tonight airs Sundays at 11 p.m. on HBO. Oh, and if you really want to be certified in elf-spotting, Oliver’s created a certificate you can print right here.

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