Riddle: Old Mr.Freddy was found dead in his study by Mr.Andy. Mr.Andy recounted his dismal discovery to the police. "I was walking by Mr.Freddy's house when I thought I would just pop in for a visit. I noticed his study light was on and I decided to peek in from the outside to see if he was in there. There was frost on the window, so I had to wipe it away to see inside. That is when I saw his body. So I kicked in the front door to confirm my suspicions of foul play. I called the police immediately afterward." The officer immediately arrested Mr.Andy for the murder of Mr.Freddy. How did he know Mr.Andy was lying?
Answer: Frost forms on the inside of the window, not the outside.So Mr.Andy could not have wiped it off to discover Mr.Freddy's body.