Hangin'Out

It was a sunny day in Usanaland and Bob, Chloe, Nik, and Kat were hanging out by the local 'haunted house.' "You think it's really haunted?" asked Bob.
"Nah, not really. I don't believe in ghosts," declared Nik.
"I don't either, Nik. Ghosts ain't real," replied Chloe.
Kat exclaimed, "The only thing that the house is haunted by is dirt, dirt, and more dirt!" At this, they all laughed, not realizing that they were indeed wrong.