Not that mad a post...
Aside from the serrations on most (serrated) knives favouring right handed use, many disposable knives have a thin blade which is reinforced when using the knife right-handed.
However, turning the knife over to use it left handed results in the reinforcing box section becoming filled with whatever it is that is being spread.
A little pot of jam for your toast or scone then only goes about 3/4 as far when spreading left handed than right handed, unless you use the corner of the toast/edge of the scone to scoop out the rest of the jam from the confines of the righty-only reinforcement.
Not at all IT related, except that my preferred breakfast before coding is typically a scone with jam and short of bringing in my own knife (which I admit might be more environmentally friendly) this is a cross which I must bear.