After the guests find the cook dead, Col. Mustard confronts Mrs. Peacock on her being given the dagger. When asked where she dropped it she says something like, "I don't know. Before I fainted, after I fainte......I DON'T KNOW!!". She says this even though she hasn't fainted yet. She faints in the next few scenes when they find Mr Body hit on the head with the candlestick.