Martin Blank writes: Sarah Slocum, an early adopter of Google Glass, was bar hopping with friends in San Francisco when a few people in the bar took issue with the eyewear when she was demonstrating it to another patron even though she wasn't recording. When she felt threatened, she informed them that she would start recording. Two of them approached her, yelling and throwing a bar rag at her, and ultimately ripping the Glass from her face and running from the bar with it. She gave chase and eventually got the Glass back, but her purse was gone when she returned to the bar. This physical level of hostility is unusual, but discomfort with Glass is common, especially among those who don't understand how it works. Given that much more hidden spy cameras are available for far less than the $1500 cost of Glass, what will it take for general acceptance to finally take hold?