you finally sneak into the dragon’s cave and find his treasure chest. you open it and there is just a macaroni drawing by the dragon’s son.
“ITS TREASURE TO MEEEEE” the dragon bellows
This is why I should never be allowed to be GM because this is something I would definitely do.
But with a Granny Weatherwax turn of nose and explanation that not all monsters are evil and sometimes chasing fairy money leaves you out of pocket.