Free Slush at Houston-Area Sonic November 6 for Texans WinIt’s BACK… Houston is celebrating another Houston Texans win, which means a free slushie for all! Take advantage of a free 20oz. “Texans” slush all day Tuesday, November 6 (cranberrry & cherry), thanks to a win over Buffalo. Rules vary by location: some say one slush per car while others give one per person. Yay, I’ve missed this!