Yeast and years ago, in a misguided attempt to look like Gillian Anderson in her X Files days, I tried coloring my hair red. I have naturally brown hair with red tones, so I thought it would work to pick a more definite red shade. Nope. My hair came out Bozo orange - I had to cut it off super short and let it grow out. fortunately I had short hair at the time, so it wasn't that big a deal, but the color was pretty horrific.
I had a similar incident, but mine was almost pink, AND done by my stylist. Who was a lovely man, but had been doing my hair since i was 9 or 10 (I was in my early 40s at that time) and really hadn't kept up with the times. He still did highlights with the cap, not foil.
I'm blonde, but its gotten darker over time, and I have both gray and white. So I get highlights to cover it up, and the gray and white make my hair look dingy as they take over!
So one time I said to him, can you lighten it, but add some red highlights? he had his colorist do it, and it was nice. Second time, he did it, and i don't know waht he did, but my hair was Bozo pink. I was not happy, and as it was some distance away, i wasn't able to go back and have him fix it.
So I scoured the Internet, and found something called "color oops" which strips dye from your hair. I figured I can try it, what's the worst that can happen? it did warn that it can dry out your hair. So I got some, and tried it. It worked really well; stripped all the pink out, and left just blonde, lighter than I noramlly got, but not un-natural.