So, last night as I was brushing out the Pony's long long wet snarly hair (we had a lot of time while doing that) we were discussing this 'n' that, and she delivered some words of advice that I am passing on to you, for free, because they are words of wisdom gratis for nothing.
"If it doesn't work on a sandwich, it won't work on a computer screen. Trust me on this."
I think we were discussing mustard at the time.
No, I don't know what it means either, but what a great fortune cookie it would make.