The next time that unprepared piece-of-work in your class asks to borrow a calculator, prank him or her with The Wrongulator.
The Wrongulator is a calculator that miscalculates every calculation you make. See how long it takes said prank victim to realize they are calculating everything WRONG. mwuahahaha
People need to be less dependent on calculators these days anyway – like seriously dude, you’re taking Calculus but you still need a calculator to multiply 8 times 7? To add 14 + 8? COME ON, if you’re not willing to make a little mental effort to double check in your head, you deserve an F!