Lead by shining example! Be the guiding light of the backpacker code by stashing a small flashlight away somewhere accessible. Then when you come back late to your dorm, show your respect by using it to find your dormbed or for toilet visits instead of whacking on the huge fluorescent striplight (which is something only thoughtless, selfish morons do). Speaking from personal experience, a mini torch also comes in handy for riding out lengthy (and frequent) blackouts in Phuket, Thailand and Vladivostok, Russia, not to mention checking for redbacks under Outback toilet seats... The Mini Maglite is ideal for the cause, running off a single AA battery and giving off plenty of light with the supplied bulb. You can even balance it on its end and use it like a candle. A joyful addition to your pack.