'Tis the Season for Mayonnaise

As I was in the checkout line of the local health food store here in Bloomington, which is ingeniously named Bloomingfoods, something rather bizarre happened. The very nice young man who was bagging my items into a recyclable paper bag, caught sight of my mayonnaise and said, "Tis the Season for Mayonnaise." Immediately, the cashier as I turned to the bagger, and he proceeded to state that the warm weather causes everyone to purchase mayonnaise and include it in all their dishes. He said, "Why have cabbage, when you can have cole slaw?" I think having seen the puzzlement on my face and the fear on that of the cashier, he continued his job without further mention of mayonnaise. But now I cannot help but to be intrigued. Does an increase in temperature subliminally cause the human to crave mayonnaise? Is there some secret ingredient within the mayonnaise that recalls the simple days of summer? I'll be the first to admit that I am not very educated in the field of mayonnaise, so if anyone out in the blog community has anything to add to help shed some light on this subject, I think we all would be extremely appreciative.