This may sound crazy but you can change the taste of your coffee with the type of mug it is consumed in! Scientists in Brazil say that drinking coffee from a rough cup will leave a bitter after-taste while the same coffee tastes sweeter from a smoother vessel. More than 230 people took part in the research, with half of them experts – including professional coffee graders. They drank high-grade Brazilian coffee from a smooth porcelain cup and also used a mug made of white ceramic with a rough finish on the outer and inner walls. Both were a similar shape and weight. The coffee was perceived as sweeter when tasted from a smooth-surface cup. The coffee was rated as more acidic from the rough cup. The results demonstrate for the first time that 'sensation transference' from the haptic feel of cup texture can significantly affect the quality of specialty coffee after-taste.