What is it with toothpaste?

As a follow up to Chicken's daughter's toothpaste meltdown...My son and her daughter are kindred spirits and will often act out in the exact same ways.  I kid you not, we had the exact same toothpaste issue yesterday morning.  Lots of spitting and crying "I don't like this flavor toothpaste!"  All referring to a tube of toothpaste that is 2/3's of the way gone!   Yes, you might say they both fall into that "strong willed child" category.  We are relying on the fact that they know their own mind and will speak it and that someday that will make it easier for them to "just say no" to drugs and hopefully a few other things too :)  Rice