The All-Night Mask is a mask featured in the Nintendo 64 video game The Legend of Zelda: Majora's Mask, that has one distinctive property - it has rather weird, red eyes that omit the rest of the grey mask.
Link would be able to buy the expensive (which happens to be the most expensive of all the items in Majora's Mask) mask once he saved an old lady from being robbed. Three days later he'd then be able to buy the mask for a whopping 500 rupees. However, it has great use if you use it while listening to Anju's stories.
Normally, Link would just fall asleep while Anju was telling him her elongated stories. However, since the All-Night Mask keeps him awake, he'd not only be able to listen to all her stories, but if he listens to the longest one of all, she'd give him a piece of heart.