Once, I heard that Elvis Presley loved peanut butter-banana grilled sandwiches. So, of course I made some. They were delicious but can't be good for your cardiovascular system to have too many ...
BTW, over here bread spreads are sold in tubs... except for peanut butter. Why are peanut butter sold in jars and not in tubs?
A tub has more surface area, making it easier to scoop the contents onto a butter-knife - especially if the spread is a bit hard.
Scooping peanut butter from a jar with a knife is unnatural and can get messy.
After a little bit of googling I could find only one brand that used tubs - and it is South-African.