Mayo on rice? Go back to Hell, you spawn of Satan!
Mayo on hotdogs, mayo on pizza, mayo on ice cream. There are those, in this world, and probably others, who are not satiated by sane condiments. No, their existence is dedicated to the eldritch application of condiments.
Mayo on rice actually tastes better than tamago kake gohan. Less salt, too, but in return more fat from the oils. (But this is just me that loves to eat strange food pairing like chili sauce banana)
Also related to mayo business: I got mayo made with soy oil last time from random super I went to, grabbed it because I don't have spare time to make it myself like usual, and there's my mom wanting to make fruit salad. Never bought mayo made with soybean oil ever.