Read these riddles very carefully because you have the chance to win a mystery prize at our next meeting. And no, it's not toilet paper 
- Walk on the living, they don’t even mumble. Walk on the dead, they mutter and grumble. What are they?
- What question can you never answer yes to?
- I have four keys, but no locks. I have a space, but no room. You can enter, but can’t go inside. What am I?
Get those brains ticking over and good luck!