Oh wait, I was looking at production

Oh so true:
Why won’t this CSS change?!
Restart server
>Nope
rm -rf everything
>Nope
rebuild dev env
>Nope
Oh wait, I was looking at production
— Mike Coutermarsh (@mscccc) June 5, 2017

Not to ruin the joke, but I find it tremendously helpful to Give Your Development Domain a Different Favicon Than Production.
Read the comment thread on that post too, there are some other very clever ideas.
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Oh wait, I was looking at production is a post from CSS-Tricks

Link: https://twitter.com/mscccc/status/871867435476951040