Or maybe different people can give different riddles and etc, just to keep the thread going?

or we could play Professor Layton

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You’re confined to a room where there are two exits, North and South. To the North is pit ten meters by ten meters wide, filled with poisonous spikes – falling in means instant death. To the South is a room with hundreds of magnifying lenses for a ceiling – anyone who steps into this room will be instantly fried by the sun’s rays. The walls that make up each of the rooms are three meters thick and absolutely rock-solid; you do not possess any weapons to break through them.

How do you escape?