Shiny glass is an item used during the 2019 Halloween event. It is found inside the Lumbridge General Store on a table. The shopkeeper will prevent it from being picked up unless the store has been filled with smoke from the smoke powder, and it can also not be telegrabbed. The shiny glass must be stolen and given to the goblins Snailneck and Grasslegs to complete the event.
Before getting to the appropriate part of the event and after completion, attempting to take the shiny glass from the table causes the player to say in the chatbox "Why would I steal that?"