Being forced to add autoplaying music to websites
This happened at least once at work, and I hope it doesn't happen again.
But yea, despite my protests against autoplaying music; my boss demanded it, and the website owners demanded it. So it in went: annoying music that plays when you open the page.
I felt like dirt after that. I had sinned against all web users everywhere.
Well it could have been worse…
The original design spec ensured that people were forced to hear music. The managers had the attitude "If they don't wanna hear it, they can turn their speakers off" which I found, frankly, bullshit. But I did enough arguing and lobbying that I convinced them to include a mute button into the spec. So there's, that