A cloak of invisibility is now a technical possibility. See http://iopscience.iop.org/2040-8986/13/2/024003 in which them damn scientists "introduce a new type of electromagnetic cloak, the spacetime cloak (STC), which conceals events rather than objects."
There are two obvious and important ramifications of this technological development. First, those scientists now can sneak up on you to watch you masturbate. You're at a computer - let's say you're sitting in your office when you decide to "get to work." Or, you're at the coffee shop and you decide to "froth your grande latte with cream."Or, you're at the public library and you want to "Dewey your decimal." Or you are at school and want to "tutor the pupil," or at church to "club the bishop." You get the idea.
Anyway, you look around, and it appears that the coast is clear. You are free to "choke the chicken," or so you think. With this invisibility cloak, those scientists could be standing right behind you watching you "burp the worm."
Second, and even worse, extraterrestrial aliens hidden by invisibility cloaks might also be watching you "topping the banana with yogurt." It is bad enough to have some egg-head watching you "liberate the tadpoles," but now you have some green species watching you "jerkin the gherkin." It is just plain embarrassing.
Why can't they figure out a way to use these devices for good and just leave us alone?