We were prototyping a dashboard website with gauges giving a visual indication of metrics, and hadn't bothered to source a proper needle graphic when we showed the very first one-iteration-along demo to the customer. Even with all the disclaimers we could give, they got really hung up on the "needle" placeholder graphic being a flat red square. By way of demonstrating the possibilities, our frontend developer replaced it with a clipart banana live. When we finalized the graphic, I added a querystring parameter to the homepage that would change the gauge needles to the banana.
As far as I know, it's still there.
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