I could be a bit biased as I don't like mayo. My dislike for mayo aside, the idea of putting a dollop of mayo in my coffee makes me want to lose the contents of my stomach. Hellmann's has suggested coffee drinkers put mayo in their coffee! As nasty as that sounds, Hellmann's is probably using social media to grab a load of attention from both lovers and haters of the condiment. Hellmann's=SMART. Side note, my older brother Chris puts butter in his coffee.