Brain teasers, riddles and jokes are great for helping our children laugh and put their brains in motion at the same time. Add to that the fun of a festive season like fall, and you have one terrific opportunity to make some great memories with the kids. Here are some silly, and yes, corny jokes and riddles to help put some fall smiles on those faces. Q: What do you use to mend a jack-o-lantern? A: A pumpkin patch. The nurse walked into the busy doctor's office and said, "Doctor, the invisible man is here." The doctor replied, "Sorry, I can't see him." Q: Who won the skeleton beauty contest? A: No body. Q: Who helps the little pumpkins cross the road to school? A: The Crossing Gourd. Q: What do you get when you divide the circu...