i like mayonnaise too.love it it fact!
i usually make my own and it's good.but it has to be fresh.fresh as a daisy to be precise.
as a matter of fact if i order a sandwich and the mayonnaise does not meet my exacting standards than i have no problem sending it back and demanding that a fresh jar be opened.
if this inconveniences the waitress i'm sorry but no amount of protest on her part,no matter what assurances she gives that she just opend the jar that morning,will make me change my mind.if she has a problem with this she can take it up with the firm that made the mayonnnaise.
because let's face it...there is too much evil in this world to be fought than to be sidelined by the cramps,nausea and diarrhea associated with the consumption of rancid mayonnaise.