This was a few years ago, before my husband and I were matried, but we'd been living together for years. It is a standard that if one of us is out of work, they do more around the house. I was unemployed and therefore doing most of the chores and he kept leaving spoons with peanut butter globs still stuck to them. Basically he'd get a GIANT spoonful of peanut butter and then not finish it. He would leave the spoons in water, but as I'm sure some people here have noticed, that does pretty much nothing to break peanut butter down, not like a crusty spaghetti fork or something.
I got kind of mad at him, and asked him to stop doing that since it didn't actually help and kind of grossed me out and he got upset back. I don't really remember what he said (neither does he, as he spent the night mindblown, like OP) but it was something along the lines of, "So what I'm just supposed to let it get dry or force myself to eat it all?" I said "No, just wipe it off with a napkin!"
The look on his face, I might as well have been explaining theoretical quantum thermodynamics, if that is even a thing.
So now we call those moments when someone suggests a really simple and usually obvious solution that we didn't even consider Peanut Butter and Spoon moments.
he should just only scoop the amount he wanted-- the best way to clean peanutbutter off a spoon is with your mouth