DOS

Space Quest V: The Next Mutation

There's a sequence in the middle of the game where you have to go in an emergency pod and catch your buddy Cliffy lost in space. On faster machines, it's absolutely impossible to do it: it's too fast, even if you reduce the game's speed to a minimum. However, if you download a slow-down utility like "Turbo" and set the speed of your computer to the lowest possible, the problem will be solved :)