Plus every friendship you've ever had.
That small, easy to hide gadget produces three different types of annoying beeps and frequencies at varying pitches -- since the beeps are short and random, they can become extremely grating over time, while remaining difficult to locate. Oh, and this one also lasts for weeks, at which point it could reduce anyone to a paranoid mess. This company apparently has an entire department devoted to thinking up new ways of being the worst friend ever ... but hey, at least they haven't figured out how to create a gadget that makes people puke.
Unfortunately someone else has ...
Sonic weapons are a type of technology that governments have developed as a nonviolent alternative to traditional methods of crowd control (unless you consider headaches, vomiting and loss of balance to be violent, that is). This is highly unpleasant military-level technology here -- so obviously someone created an affordable gag version of it.
"Use with extreme discretion" or, y'know, whenever.
Yes, this Sonic Nausea gadget is just a few clicks away from any dick in the world with about $40 to his name. Like the Annoy-A-Tron, it's easy to hide and difficult to find. Unlike the other gadgets in this list, it's not just annoying, it actually causes physical consequences like "headaches, intense irritation, sweating, imbalance, nausea or even vomiting." It's like that PC Prank thing, only for your brain, and instead of messing with your cursor, maybe it loosens up your bowels.
He's laughing on the inside.
The gadget works by generating a specific combination of sound waves calculated to make you physically ill. The effect varies from person to person: Users over the net have described it as a "slightly queasy feeling, almost like you have to belch but can't, and it's lasted about 15 minutes" and "disruption to concentration in some, heightened aggression in one individual and downright irritation to many younger people."
As far as pranks go, this is as hilarious as infecting someone with a bad flu. At least you don't have to worry about your computer, phone, TV or girlfriend bothering you while you tend to that migraine. Speaking of which, we've actually done the math, and it would take a minimum of $239.92 (plus shipping) for a dedicated asshole to buy all the gadgets mentioned in this article and use them against you. Our advice to avoid this, we guess, is don't have shitty friends.
Only available for use by military, law enforcement or literally anyone with a credit card.
For more products to improve your dickishness, check out The 10 Most Baffling Computer Gadgets Money Can Buy and The 13 Most Irresponsible Self Defense Gadgets Money Can Buy.