Pink Hoppers?

Why does pink work so well??

I had a few days in the past couple of years where my usual hopper patterns weren't fairing so well. I had tied up a variety of both pink and red hopper patterns and in one instance, they would not touch anything that wasn't red or pink. I guess I haven't given it much thought other than to say it's a good idea to carry crazy colored hoppers in your boxes. Any ideas??

And a video to boot: