Magic Screen keeps cellphones for your eyes only

Remember back in the day when LCDs were so crappy that the viewing angle was about 2° and you had to use locational triangulation to make sure you weren't staring at an inverted image? Well, those days are long past, but if you're harried about your next-seat neighbor peeping that steamy text to your Mr(s)., then feast your eyes on the Magic Screen. For about three bucks you can stick it on your cellphone's display and anything outside a 30° viewing angle just sees a darkened screen—which may just make you look crazy to strangers, instead of merely severely bored.

[Via textually]