A bottle and a tin cup by Injun Joe—why would two ordinary objects make a room 'ha'nted'?

“Huck, I didn’t wait to look around. I didn’t see the box, I didn’t see the cross. I didn’t see anything but a bottle and a tin cup on the floor by Injun Joe; yes, I saw two barrels and lots more bottles in the room. Don’t you see, now, what’s the matter with that ha’nted room?”