The bottles of mayonnaise left on tables in pubs really rile my German pal. This is egg, she'll shout, this will make you sick! It should be in the fridge! Then she'll go and throw it in the bin and demand a fresh bottle. She's very German.
I don't think pub mayonnaise is a natural substance (and for the record, with that much oil, it's probably OK. I had some HP sauce the other day that was BBE 2018.