Last week, we explored the darker side of life hacking. For those who missed out, we're assembled every naughty post in one place. It's all here -- from remotely monitoring someone else's computer to farting in public undetected.

The "KeySweeper" is a tiny, Arduino-powered wireless sniffer that captures data sent by your wireless keyboard to its receiver. That's right -- it's a keylogger, and it doesn't have to be plugged into your computer to work.

A hotel room safe is designed to keep valuables like your passport or cash locked away while you're travelling. But as it turns out, most hotel room safes are relatively easy to break into, so you might want to think twice about where you stash your most valuable items.

Every year, Lifehacker celebrates the dark side of life hacking with Evil Week. For those who still aren't feeling suitably evil enough, we've assembled some of our favourite posts from the Evil Week archives -- from snooping on other people's phones undetected to taking the perfect nude selfie.

Keep your friends close, and your enemies closer. You may not like them, but that doesn't mean they can't be useful to you -- or at least kept at bay. Here are four clever psychological tricks to turn them into allies.

Many modern video games present the player with narrative choices that affect the outcome of the story and the fate of supporting characters. As much as some games give you the choice to be delightfully evil, most people will still feel the urge to do what's morally right. This is a shame, as being the bad guy often lead to a more satisfying story. Here are some of the top moments where it's better to make the "wrong" choice.

There's a reason the words timeshare and scam often go together: in most cases, buying a timeshare is a bad financial decision. Because of their notorious reputation, timeshare companies tempt you with freebies like dinner vouchers, concert tickets, or awesome vacations. All you have to do is survive a gruelling, high-pressure presentation. If you like playing with fire, here are some tips for making it to the other side without caving -- and with your free gift.

We know a lot about what makes relationships work -- and fail. If you're too much of a wuss to break up with someone yourself, here's how to do the exact opposite so they will break up with you.

Secret, anonymous messages aren't just for the dastardly. Luckily, a little privacy isn't difficult to get. With some effort and a spare phone, you'll be whistleblowing, protecting your privacy from harassers, and staying anonymous when selling on Gumtree or looking for dates on Match. Here's how.

Tinder can be great for a quick hook-up, but more often than not it's a never-ending trawl through photos that make you wonder what exactly they were thinking. Swipe for long enough and you'll start to notice a distinct theme -- so what better way to celebrate the demise of modern dating culture than with a drinking game?

You can learn the basics of lock picking from a GIF, but for a more nuanced look at the techniques required to actually get a lock open without the key, check out NightHawkInLight's latest tutorial where he uses nothing but a pair of strategically bent hairpins in the process.

Worried someone might intrude on your evil lair? This DIY sonic tripware alarm is easy to build, decently loud, and is perfect for simple hide-and-seek games or establishing a perimeter around whatever you'd like to keep safe.

It’s a time honoured tradition that the banker always steals from the bank in Monopoly. Most cheating in board games isn’t anywhere near as brazen. At least, not if you want it to work. Being tricky is tricky. Cheat too often or too heavily and nobody will play with you. Cheat a little and your opponents may not even notice.

The first evil skill I acquired was subterfuge. Trying to deceive my parents is one of my earliest memories. I escaped from my crib by removing one of its loose bars and then, after climbing out, put the bar back in -- as if to trick my parents that I was still in there.

When it comes to sharing files on BitTorrent and Usenet, it doesn't get any better than private trackers and indexers. But by definition, they're very exclusive, so you can't just waltz in the front door. Here's how to get access to the best private file sharing communities.

Remember when Anonymous threatened to destroy the entire internet? We laughed and ultimately their words were just hacker hubris. But it got us thinking -- could someone actually destroy the internet? We did some digging, and guess what: with enough effort, the entire thing can be shattered. Physically. Completely. Here's how to kill the internet.

Whether you're trying to catch an intruder or give someone a good scare, you can build this simple tripwire alarm in only a few minutes.

Sometimes in this world, you want to make someone as wildly uncomfortable as humanly possible. That's why Facebook's here.

Flatulence is perfectly natural, but when it happens in public, you'd do anything to avoid the embarrassment. Whether they're silent and deadly or loud and proud, here are the most dastardly ways to pass gas around others and slip away like a fart ninja.