Put this clip right after a character spots or picks up a lantern in your edit, then follow it immediately with a shocked meme sound for the other character's reaction to the unexpected offer.
Über diesen Sound
This is a very short voice clip, under a second long, of shopkeeper Morshu saying the words lamp oil in his deep, matter-of-fact sales tone. Hearing just that offer out of context feels oddly funny and inviting, like you have stumbled into a strange shop where that one item is suddenly the most important thing in the world.