My favorite baffling RNG bias was in the game Maplestory. It always seemed like RNG was extremely "clumpy". For example, critical hits would frequently come in

My favorite baffling RNG bias was in the game Maplestory. It always seemed like RNG was extremely "clumpy". For example, critical hits would frequently come in bursts - you might get around 5 seconds of non-stop crits. The crafting system was heavily chance based. You'd get say 7 attempts to augment a piece of gear, using 'scrolls' that had a certain percentage chance of succeeding. The lower the chance, the bigger the improvement to your gear. So a pair of gloves that had 7 successfully applied +attack 10% scrolls would be incredibly valuable. The superstitious method to crafting (which, anecdotally, worked incredibly well) was to get a ton of gloves and a ton of scrolls, and apply one scroll to one pair of gloves and throw them away if it failed. Once you had a single success, you would apply the scrolls as quickly as possible to try and ride the RNG wave. In my experience, this would very frequently result in getting 3+ successes in a row.