What you think is your best work will drop off the bottom of the board unnoticed, while something you knocked up in ten seconds flat will be acclaimed and Front Paged.
"That's brilliant! Congrats on the FP!"
"It only took me a few minutes, I feel like a fraud."
"Ah, that's Fnord's Law for you."
Origin: http://www.b3ta.com/board/216574