The moment of truth – about NASCAR Sprint Cup driver Tony Stewart’s love for Burger King’s Whopper sandwich – takes place at 1 p.m. Tuesday. Stewart has agreed to undergo an hour-long polygraph test with questions submitted by fans.

It’s all part of Miami-based Burger King’s “Tony Stewart School of Endorsements” ad campaign that launched in September and includes CHiPs star Erik Estrada hawking “Estrada” sunglasses and Carrot Top trying to sell a juicer. Stewart tells the class it should “only endorse things you believe in.” Thus the polygraph test, which can be seen at truthabouttony.com.

Meanwhile, Estrada’s sunglasses have become something of a novelty: 150 pairs are being auctioned on eBay with the proceeds going to Burger King’s Have It Your Way Foundation. Check them out at estradaglasses.com, but be forewarned, as the site says, they’re a novelty, not for actually seeing.