Volcanos are just like plants
Context: We found a hexagonal softball sized item that had a rattling coming from inside. My druid was able to figure out that it was volcano glass. One of the clerics, who is not very smart, was convinced it was a volcano seed.
Cleric: I bet you 20 gold that if we plant that in the ground it will grow a volcano.
Druid (me): That’s not how it works, they don’t grow.
Cleric: Well what your saying is that they are just full grown volcanos when they are born and I know that you are lying about that.
Druid: Thats not what I am saying either. (I then begin to explain where volcanos come from.)
Cleric OOC: I rolled a will save to disbelieve everything she is saying. *Rolls a 14*
Druid OOC to DM: Can I roll anything in order to make him believe?!
DM: At this point no, he believes it is a seed.
Druid: Fine, but this not not win you the bet.
Witch: No, he is definitely right, this is definitely a volcano seed.
After more discussion we decide to break it open. The witch detects magic on it and picks up a ring.
DM: You identify this as a ring of volcano growing.
Druid: ARE YOU KIDDING ME? (leaves the table for a couple minutes)
When I come back it was actually a ring that gives a PC a bite attack, and had nothing to do with volcanoes.