Way back when I was in high school, it became a fad among the tech-geeks to have our TI-85 graphing calculators modded with a "turbo" switch that would let you

Way back when I was in high school, it became a fad among the tech-geeks to have our TI-85 graphing calculators modded with a "turbo" switch that would let you run some games like Wolfenstein and Tetris at better speeds. It involved cutting a hole in the back plastic casing inside the battery compartment to make room for the switch, and then soldering a few connections on the board underneath. There was one kid who was doing it for everyone at $20 a pop, but he made no guarantees about not accidentally bricking the calculator in the process. I was a little apprehensive about having him do it since TI calculators were (and still are) ridiculously expensive, and asked him what his success rate was. He told me it didn't really matter because even if he accidentally screwed up, all you had to do was go buy a new TI-85 from Future Shop (which was like a Canadian version of Best Buy before they were actually bought by Best Buy), put the broken calculator in the box, and then return it the next day for a full refund. He would then mod the new one for no additional charge. My turbo switch was installed fine so I didn't have to pull the scam, but I knew a few kids who did.