Ok, I really enjoy thinking puzzles, and I think this is one of the best I've heard.
What is greater than god,
More evil than the devil?
Poor people have it,
Rich people need it?
And if you eat it, you'll die?
Also, here's another good one:
There are three switches, at the bottom of a staircase. Upstairs is a lightbulb, that one of the three switches turns on. You have as much time as you need downstairs, but you need to figure out which switch turns on the lightbulb. You cannot see the light from downstairs, and the other two switches don't turn on anything else. No one can help you complete the task, and you can only go upstairs once to check if its on or off. How do you figure out which switch turns on the light bulb?
Oh, and one more.
There are four people who need to cross a bridge. It is the dead of night, and you can only see with the aid of a flashlight, which there is only one of. Each person crosses the bridge at a different rate. Those rates being 1 minute, 2 minutes, 5 minutes, and 10 minutes. This rate applies only for going one way, and the people have to cross at the slower person's rate. The bridge can only carry two people, but one has to come back to give the flashlight to the other people. You have 17 minutes to cross the bridge. How will you do it?
The winners with have there reputation added on to, if that's allowed.