Computerworld - https://www.computerworld.com/article/3264015/it-industry/sometimes-that-penny-just-takes-a-while-to-drop.html#tk.rss_all
Programmer pilot fish receives an email with an attached document and a pretty standard request: Make updates and then return it.
“It was a four-page document, which I printed duplex to save paper,” says fish.
“While talking with the sender, I mentioned I had to rescan it, as I had printed it duplex, and that I would then email it to him.
“Ten minutes later he asked me to rescan it one-sided, as he had to submit it non-duplexed.
“Scratching my head, I asked how he printed it. He said he printed it duplex, since that is how I had.