Emailed to me from another humor list (Joanna's Jokes)
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Six of us at the office decided we wanted to install remote starters on our cars and thought we'd get a better deal if we went to the same garage. We shopped around and found a place that would do all our cars at the same time, and we went on a weekend to have it done.
At the end of the day on the following Monday, Alan aimed his remote and pressed the button. His car flashed its lights and started - then we noticed Mike's car had started, then Rob's and Dave's, finally two others.
The installers had given all our remotes the same frequency.