bizarre aesthetic and influence in the stop-motion animations industry, the Quays based their "brain freeze" ad on a late 19th-century photograph of a female contortionist. In the commercial, a curtain reveals the contortionist balancing on two chairs, bending over backward to sip a Slurpee. She falls victim to "brain freeze" and turns into an ice cube. Starting in 1995, free Slurpee coupons have been made available through "Operation Chill" for US police officers to distribute to children. In 1998, 7-Eleven launched Slurpee lip balm to the market. Other "Slurpee-flavored" products have included Slurpee gum, which had a liquid candy center. In 2002, The World Wrestling Federation launched promotional cups featuring The Rock, Rob Van Dam, Lita with The Hardy Boyz, Stone Cold Steve Austin, Kurt Angle, Undertaker and Trish Stratus. The designs were on 40-ounce Slurpee cups and 34-ounce thermal mugs. In 2004, 7-Eleven created an edible Slurpee straw. In 2005, 7-Eleven promoted the film Star Wars Episode III: Revenge of the Sith, by making a Mountain Dew Pitch Black "Dark Side" Slurpee which came in a cup shaped like Darth Vader's helmet. In 2007, as part of the Kwik-E-Mart promotion for the feature film The Simpsons Movie, Slurpees at 7-Elevens were renamed "Squishees" (the analog in the Simpsons universe) and sold in special collector cups. Starting on November 4, 2008, 7-Eleven worked with Nexon to promote Slurpees to gamers that play on Nexon.net. The Slurpee cups had images printed on them from certain Nexon games, and a code printed on them that could be redeemed on a website for special in-game items. Also for professional wrestling WWE's Summerslam 2010 7-Eleven offered collectible Slurpee cups of Rey Mysterio, John Cena, The Undertaker, Triple H, and Kelly Kelly. They also came with collectible straws with figures of each wrestler on them. The flavor used for the promotion was Barq's Root Beer. As well as for the 2011 SummerSlam, which again featured Cena, The Miz, 2009 WWE Hall of Famer "Stone Cold" Steve Austin, and The Rock. The flavor used for the promotion was Fanta's Berry Citrus Slam. Every year on 11 July (7/11, month/day), 7-Eleven offered a free 7.11 fluid ounce (210 ml) Slurpee in the US and Canada thru 2014. From 2015 to 2019 & since 2021, the size increased to a 12-fluid ounce (355 ml) size. 7 Rewards members are given a free medium Slurpee loaded into their app