Selling Out: A Brief, Highly Selective History of Product Placement at the Movies

The Cannonball Run (1981)
Emerging from a 7-Eleven carrying bags of Ruffles and Fritos, Dom DeLuise tells the gang (including Burt Reynolds, above, and Farrah Fawcett) that he's procured them a bunch of goodies and himself a "Big-Gulp Dr Pepper." 7-Eleven was happy to promote the film as a thank-you, but Dr Pepper should have coughed up something as well, because DeLuise actually breaks into the Dr Pepper theme song ("I'm a pepper, you're a pepper," etc.).

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