The brain is an amazing organ. 49 year old Alan Brown had a stroke. Here's what happened:
...Brown was still recovering from his surgery when he realized that his doodles, once limited to stick men, had become strikingly more realistic. Brain surgery can cause significant changes in behavior and abilities. Luckily for Brown, his change was for the better. He began painting (examples of his work can be seen here) and eventually quit his day job to open a gallery, where he displays and sells his art.
His art is dark. But definitely not stick figures. Click that link and see.