> What has keys, but can't open locks? (A piano)
> Forward, I'm heavy, but backward, I'm not. What am I? (The word "not")
> What goes up and down but never moves? (A staircase)
> What is always in front of you but you can't see it? (Your future)
> What has a bed but no head or feet? (A river)
> What has a neck but no head and wears a cap? (A bottle)
> What is black when you buy it, red when you use it, and grey when you throw it away? (Coal)
> What is so fragile that saying its name breaks it? (Silence)
> You measure my life in hours. I serve you by expiring. I'm quick when I'm thin, and slow when I'm fat. The wind is my enemy. (A candle)