A woman exclaims that she was robbed. She was reading in the dark, candles were next to her. She says the thief opens her cabin of jewelry and leaves and enters from the window. He left the window open so she feels a drift of wind coming towards her. She turns the lights on and sees what happened.
The candle wax was going down straight. A policeman closes the window and cabin then tells her she's lying just for the cash reward. Why?
Because if the drift of wind came in, the candle wax would be dripping to the side, not straight!