When you’re stuck in prison for years (or life), going into a store or shopping online are out of the question. So, there are inmates who spend all of their free time constructing unconventional gadgets and tools, rather than starting fights. Whether it be a radio transmitter, pistol or even a tattooing machine, these inmates have successfully made their own versions. Click here to view the first image in today’s viral picture gallery. Continue reading for the five most popular viral videos of today, including one of Nirvana’s “Smells Like Teen Spirit” played entirely with hard drives.