The Invisibility Shield Company has created an, don't fall out of your chair, invisibility shield. The shield uses a special array of lenses to redirect light around the shield, making anything behind it invisible.
Possibly even more shocking: it's not THAT expensive. Like, it's pretty accessible. A, 8X12 is $65. Granted you'd really have to work on your yoga skills to fit behind that, but I believe in ya, bud.
If you suffer from paranoia... I'm sorry you just read this. I'm sure there is no one with an invisibility shield in your hom-OH CRAP LOOK OUT BEHIND YOU. Just kidding. Nothing there. Cuz they're invisible.