1: Arbuckle: A Garfield Fan Film

5: Most computers can't generate truly random numbers. Instead, "random" events in video games, and randomized algorithms, use a type of algorithm called a PRNG (pseudorandom number generator). It takes a "seed", an arbitary number that is different every time the PRNG starts (often the current time), as input, and transforms it into a sequence of numbers that is always the same if you enter the same seed, but nearly impossible to predict if you don't know the seed.

Some PRNGs are easier to predict than others, or are used in such a way that their seed is predictable, and this is useful to video game speedrunners (who remove all luck factor from a game with precise movement in a trick called "RNG manipulation"), as well as hackers, since some encryption algorithms use random values to prevent certain attacks.