Riddle: There was a man, who never left his house. One day, he didn't feel good so he turned off all the lights and went to bed. Why did this cause a lot of people to die.
Answer: He lived int he lighthouse. Without the light from the lighthouse, ships crashed.
Riddle: I am a sentence that can be flipped around yet still be the same. You may find me strange but here's a hint, I trade with something that brings allergies and a treat to a cat. What sentence am I?