Quote:
Originally Posted by J. Strnad
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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Welcome to the Monkey House, by Vonnegut, had - IIRC - a short story in which the ruler of the country wore a bomb around his neck. When enough people went into the voting booth and voted "no," the bomb exploded. Of course, every time a new guy came to the country, they made him ruler.
This device could be adapted to your solution. A little messier, perhaps, but less of a capital investment. Besides, the city inspectors would always be coming in to make sure that your chair spikes were sterile.