"While it's vain to presume what goes on in another human psyche, this physical powerhouse of a man - think Yul Brynner - is arguably a troubled, tortured yet deeply sensitive soul. The result was a string of musical phrases and artistic exclamations that were rendered with unabashed passion. Sometimes achingly beautiful, sometimes menacingly angry, his music making was utterly absorbing.....Plenty of other oddities peppered the evening, as well. Pogorelich opened the program so abruptly that an adjustment of the piano bench and music stand followed awkwardly while he continued playing. Some hefty coughs ensued, which were later explained in the pianist's surprisingly forthcoming remarks. It turns out that he wasn't feeling well and that he will be seeking medical attention during his stay in Denver." Link
and then there's this
Asked what he thinks today when he hears himself described as "eccentric," "arrogant," and "difficult," the pianist said, "That was my image. I worked on it myself like a child making a toy. That was the price a 22-year-old had to pay to make an awful lot of money. People are always after the 'dark power,' like in Star Wars." <Link.
You can see Pogorelich playing Scarlatti here.