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Let's see....
You order your food and every dollar you spend gets you a token. You take the tokens to your table and put them in the table meter. The spikes on the chair retract. When your time is nearly up, the chair begins to vibrate ominously, giving you five minutes to buy something else and get more tokens. Otherwise, up shoot the spikes. Hopefully you are not sitting down at the time.
Would that solve the problem?
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