>Zoklet Bad Ideas/Shoplifting
Zoklet used to be a forum, in the same spirit of and descended from ToTSE (Temple of The Screaming Electron) that included a "bad ideas" board containing discussion and how-tos about numerous blatantly illegal acts. One of these threads was the infamous "Shoplifting Thread," which was a compendium of information concerning various methods of shoplifting. It contained detailed information on everything: basic techniques, the steps loss prevention must go through to successfully apprehend a shoplifter, security tag detachers, magic bags, return fraud… the list goes on. Users maintained plausible deniability by referring to themselves as "SWIM" (Someone Who Isn't Me)
An archived version of the thread can be found at the following link, as Zoklet no longer exists: http://web.archive.org/web/20140913121845/http://www.zoklet.net/bbs/showthread.php?t=285369
>4chan fake coupon debacle
Around 2009-2010-2011, coupon threads began appearing on 4Chan's /b/ board. These contained fake, photoshopped coupons that would actually scan as legitimate when taken to stores. These threads and their contents spread like wildfire since they could be printed out of a regular printer and were accepted without question at 99% of retail stores (most had a "if it scans, we accept it" policy at the time). Coupons were created and circulated for EVERY PRODUCT IMAGINABLE – food, toiletries, gaming consoles, iPods. In their heyday, they were also totally safe to use, considering stores were not aware of the wider movement going on at the time, feigning ignorance would always get one out of a jam if the coupon were not accepted. "I found it somewhere" or "I won it on one of those online survey-taking sites" were common excuses. And this was all made possible thanks to some dude who figured out the coupon system used by retailers nationwide and released a how-to guide that was subsequently spread far and wide across the internet, until two or so years later he was apprehended by the FBI and stores began warning against these counterfeits.
Pictures related, they're the second version of the coupon how-to guide and an example of the counterfeits it could be used to create. Don't try this at home, however – the coupons are expired and stores nowadays have explicit orders to no longer accept these.