It's not the spoons so much as the feckin' right-handed butter knives....

I don't know about butter knives but I've read of problems with some other knives. At a guess, I think it might apply to saws too - might explain why my hacksawing is so poor.

Apparently what they do is design the blade on some things to compensate for a right handers tendency to lean/pull one way, sort of straightening out their "natural error". Used in the left hand, this compensation will try to pull things further off line.