Shoulder surfing has long been seen as an invasion of privacy. In the digital age where handheld digital assistants such as phones and tablets contain pictures, texts, messages, books, videos, and more; the act of peeking over another's shoulder has become more commonplace. A recent survey by a team of researchers at the Ludwig Maximilian University of Munich have found that the perpetrators of the crime did it casually and opportunistically because they were simply curious. "However," the researchers wrote, "both users and observers expressed negative feelings in the respective situation, such as embarrassment and anger or guilt and unease." Nobody really likes the idea that other people are looking at their screens. When they imagined being observed, survey participants reported negative feelings - that they felt they had been spied on, harassed, or that they were angry - in 37 cases, with just one respondent reporting "positive feelings." (And "amused" that someone was watching.) Other people also do not enjoy being asked about other people's screens, in my experience, in part because they know what they've seen, and that they probably shouldn't have seen it.