Good Riddles

Question: My thickness is no more than a few centimeters, yet my depth can span to infinity. Although mundane, I intimidate most animals. When in my presence, you will inevitably follow me. What am I?

Question: One day a man broke his leg. When he was sent home from the hospital he had to use a wheelchair. The doctors told him he could not go up stairs. When the man got home he realized he had stairs to get into his house on both sides. The man saw his neighbor, the doctor who x-rayed him at the hospital, getting out or her car. The man asked "can you carry me up the stairs?" The woman replied "no." Why?

Question: After Timmy broke his leg he had to use a wheelchair. For PE, he had to give his teacher an excuse note. The teacher ripped it up and told Timmy to run with the other kids. Suddenly, Timmy felt a kick in his leg that was in a cast. No one had kicked him. Timmy was so mad he got up and walked to the other kids to asked who kicked his leg. Timmy was so excited when he realized he was walking that he ripped off his cast. Just then Timmy... Finish the sentence

Question: Martha Speaks walked up to a fox and said, "what does the fox say?" What did the fox say?

Question: What is big, has 4 feet, and can fly?