plenty of popcorn to get you through the long space voyage

We also spent part of one holiday season weighing the uneaten popcorn left behind (or thrown away) after the upbeat movie My Big Fat Greek Wedding, and compared it with the popcorn left after the gloomy “intellectual” film Solaris. Our garbology director showed that the average buckets of popcorn left behind in Solaris had 29 percent less popcorn in them than those left behind in the happy movie.

(from Brian Wansink, Mindless Eating, p144-145)