BBC BuzzBall drinks are popular with a young crowd - including Caitlin and Katy In one viral TikTok, a grandmother is seen sprawled out on a carpet, drunk, next to a Christmas tree. The video cuts between her necking an alcoholic drink and gazing up at the camera from the floor, happy but bemused. But this TikToker's grandmother hasn't had one too many sherries. She's been drinking a popular sugary corner shop drink that people in their teens and 20s have been getting their older relatives to try as a joke. "POV you thought Christmas Day was a good time to introduce BuzzBallz to your grandma", the caption reads. TikTok is awash with videos like this and if you go to any student flat party, chances are you'll see a stash of the brand's iconic ball-shaped plastic containers in vibrant shades of red, green and blue.…