Have you heard this one? I hope you have not!
A man was lost, so he got out of his car and walked up to a farmer's house to ask for directions. As he approached the house, he saw a mean-looking dog sitting in the yard. The man wanted to know if the dog just looked mean or really was mean, so he stopped and asked the farmer, "Does your dog bite?" The farmer answered, "No", so the man continued walking toward the farmer. The dog suddenly jumped up, grabbed the man's leg in his mouth, and bit him. The man pulled away and shouted angrily, "I thought you said your dog doesn't bite!" The farmer smiled and replied, "That's not my dog!"