I'm not sure I could eat a whole jar in one sitting but I do take spoon fulls when I'm using it for something else. I love mayo. I also eat butter in disgustingly large amounts. Once my friend dared me to eat a whole cube and I did. But that was my freshman year.
mindspell: "tuna fish" refers to canned tuna. as you know, it's EXCEEDINGLY different from lovely red tuna steaks/tekka and therefore i support its usage.
"fish" is a "winnowing" term in the language. it means that the basic root "tuna" does not necessarily signify the canned tuna, but the red, delicious fish flesh. ie, if i say to my roommate "let's have tuna for dinner", she thinks i mean the actual fish, not that gross canned stuff.
which i think is great, actually, and i would normally expect less from the American palate/psyche.
The only problem I have with that rationale is that Tuna has not been readily available for Americans (us too) except for the very rich and the fishing area people (that actually fish Tuna) in any other form than the canned stuff until recently.