While playing Old School RuneScape you may notice the occasional strange event happening near you. These events can happen at any time, and at any place. Some are potentially harmful, while others can benefit you. If you keep your wits about you, you may well profit from these events and come off better because of them; but if you're not paying attention, beware!
Some random events will teleport you away to strange locations, which may or may not be part of RuneScape itself. If you are teleported to these locations you will remain there until you complete the requirements of the random event; so, even if you log out you will find yourself in the random event when you log back in. Once you have completed the random event you will be returned to the spot you were taken from, except in the case of the Lost and Found Office, which will send you to the point you were trying to teleport to.
Some places are protected by guardians whom you may encounter on your travels. They are usually quite powerful and often your best option will be to run away, as they won't pursue you for very long. If you feel you're up to the challenge though, you can try and defeat them, collecting the items they may drop.