Only one, Bakaninja. The elven fighter was suggesting that they should leave and burn the whole place down, long before we got to the first haunt. She was also the only person to notice the Worried Wife haunt. She took one look at the footprints rising in the dust, thought for a moment, and declared, "I'm out." The character refused to enter rooms for the rest of the adventure. And, from her perspective, I can see it. She's a warrior. She hits things and makes them fall over. She can't hit something like this, so she's completely unable to protect the party.
Fortunately, the rest of the party realized that they were learning more of what was going on by subjecting themselves to the haunts. The paladin/cleric was able to knock out the one in the kid's room through channeling, but when he realized that they were depriving themselves of clues, he stopped. They also got pretty lucky on saves. All of the really bad ones they were able to resist.