Umm, I'm too embarrassed to ask which kind of Karo - do most people know there are "varieties"? LOL - clear or golden? IOW, "light" or "dark"? I only keep clear in my pantry and use molasses for anything "dark."
The only way I found out it was honey in the school PB was that one time they forgot to mix them and they put honey on one slice of bread and PB on the other, so I *saw* it in my sandwich, little foodie sleuth that I am, lol.
We always used the clear Karo - mix it in a bowl then put on the sandwich......;^)