I sat in the subway, played the Blood Bowl on a tablet (who is curious, this is such an American football simulator by Warhammer). He was completely absorbed by the game, rushed to victory and almost made a fateful mistake. But in a fraction of a second of the way I led my player to the touchdown, my finger suddenly stopped by a random stranger sitting next to me and pointed me to my mistake. It was my uncle, 55 years old. A very positive experience :)