Hot and Cold An old man goes into a shop one day to look around. He goes to the counter and sees an item up on shelf he's never seen before. He's asks the girl who's running the cash register, ""What's that new item there on the shelf?"" ""It's a thermos,"" she said. ""It keeps things hot and it keeps things cold."" ""I'll take one to try then!"" The old man says. The next day, the old man brings the thermos to work, and his buddy comes up to him and asks, ""Whatcha got there?"" The old man resp…