On July 11th Free Slurpee Day is back and 7-Eleven is pulling out all the stops for its 98th birthday. In addition to a free small Slurpee at participating 7-Eleven, Speedway, and Stripes stores, loyalty members can score a second free Slurpee later in the month, and even grab a tongue tattoo that changes color when you sip. The fan-favorite MTN Dew Infinite Swirl flavor is making a return, and there’s merch, delivery discounts, and a chance to win $5-thousand daily through the app. Tongue-toos are only available in select cities, so check the list and get ready to celebrate.