Japanese mayo is super different from occidental mayo.
Their mayo is actually good as a condiment for omelettes and such. I could even imagine it being okay on pizza. Ours, however, is disgusting if you get a full-on taste of it, and must be used with great care.
Ketchup, on the other hand, is universally inoffensive.
I just can't get comfortable without shorts and a shirt, especially when it's hot. I need something to absorb the sweat, so my skin isn't adhering to any surface it comes into contact with. Which maybe only happens because it's so dry here.