For the preschool set, I have been wondering about this in terms of perfectionism: that hating to have a shirt get even a little wet, and other similar tantrum triggers.
My dd2.5 will scream if her hands get sticky usually, but if she's playing with gooey stuff on purpose she's pretty ok with it. I thought the wet shirt thing was an over-excitability, but I wonder how much some unplanned water might upset the perfectionist. She seems to take after DH in this way.
Is perfectionism part of the concept of over-excitabilities?