Working in kitchens when I was younger really put me off of mayonnaise and salad oil, especially cleaning the deep fryers. I used to mix up batches of ranch starting with 5 gallon buckets of "heavy duty" grade commercial mayonnaise. Large amounts of mayonnaise still make me wince a little...

When you work with these in industrial quantities, they inevitably ruin your clothes and insinuate themselves into your person.

There's nothing like coming home reeking of fryer smoke and mayo for a couple of months to make you want to trade the fries for a house salad -- vinaigrette on the side please.