Dense As Rocks
My mom is an amateur geologist. She makes polished cabochon rock necklaces to sell at gem fairs. She runs into a lot of interesting potential customers.
Customer #1: “You must have painted these! There’s no way the rocks are colored like that naturally.”
On another occasion:
Mom: “These rocks formed over millions of years.”
Customer #2: “No, they must be fake! The world is only six thousand years old!”
Neither person ended up buying anything.