5 Philosophers do nothing but eat and think.
They have a table with 5 chairs, 5 plates and 5 forks.
Each of them eats with two forks.
Ensure that none of them starves.
First I teach them to always take the left fork first.
Then I smash one of their chairs.
Since they can't repair the chair (they think, but they don't build), there are only 4 places left, and so they have one leftover fork which gets passed on, once one finished eating.
Inspired by Willim Stallings' Operating systems: "Use a servant who lets only 4 dine at the same time"
Naturally now they have to either change places or move chairs, so they might still need a servant :)