Even gross things.
Case in point. The other night my family went out to a local brewpub with my mom and dad for dinner. The kids ate macaroni and cheese with a side of apples and mandrin oranges. Near the end of the meal, Toddler starts choking and sputtering on a piece of orange. After a moment or two, she coughs up the offending orange onto her plate. She then places the spit-out orange into her sister's fruit bowl, and then Preschooler promptly eats that very same orange.
Still, I know this sisterly love will only last for so long. Pretty soon they'll be old enough to annoy each other, and then it may not be until they're grown up that they can say they are best friends again.
But I bet by then they'll be over the whole "ABC gum" thing. At least, I hope they will.