This Memorial Day weekend is forecasted to be the biggest ever at the box office, with two very different films dominating with huge grosses. The Hangover Part III is expected to gross upward of $80 million, which is pretty impressive considering that the raunchy comedy is facing off against $160 million worth of crashes and eye-popping explosions in Fast & Furious 6, which is expected to win the weekend. That makes sense—after all, it’s conventional wisdom that action-heavy blockbusters dominate holiday-weekend box offices. But the massive gross that pundits are predicting for The Hangover Part III puts the R-rated comedy—something that never used to be considered box-office candy—in good company. Just a few films have bucked that rule and opened Memorial Day weekend with huge numbers—without the bangs, booms, and bams. Here’s a look back at the comedies and family fare that defied the odds to become unlikely Memorial Day hits.