The kill switch idea is very basic. The really interesting part is what you do with it.
The overall idea here is to control who witnesses the effect of the kill switch.
Usually, the approach I use is to find some way of identifying the client visiting the website.
Eventually someone will let them know that their site is misbehaving. If they cannot reproduce the problem on their own machines they are going to have a much harder time realising what is going on!
There are a few ways of accomplishing this.
I'm sure you can think of a few more. Have fun!
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