It was a hot, muggy, overcast day. Shadow was waiting on the lawn when Sid Shady came out of his house wearing a pair of shorts and a wristwatch. “There was a robbery in town about two hours ago,” said Shadow, “According to the witnesses of the bank, the robber fits your description.” Shady laughed as he lay back on the hood of his pickup truck. “This truck and I just returned from Pine Ridge about ten minutes ago. That’s over 500 miles away in case you didn’t know. You can call the cousin I was visiting and he’ll verify my story.” Shadow looked at his watch and said, “It’s 4 p.m. now; what time did you leave Pine Ridge?” Shady glanced at his watch and said, “I guess it must have been about 7 a.m. I had nothing to do with that bank hold-up. “You’re obviously lying,” replied Shadow. Why?
Solution
If Shady had been driving his truck for the past eight hours as he claimed, the hood of his truck would have been so hot that he would not have been able to lie on it without burning his bare back.