what do skeleton have in mouth (1d6)

1 – a second mouth made of even more bones
2 – a collectible figurine of a capering rat
3 – a six-sided die (convenient!)
4 – a scarab beetle that can whistle
5 – a door to a magical realm where hills are made of candy but you gotta be skeleton mouth-size to go through, sorry pal
6 – germs, don’t go touchin’ skeleton mouths, din’t your momma teach you anything?