How I know I'm a biology teacher

I saw many many piles of scat on the trail last weekend (more about our trip on Sparkling Squirrel Blog) and after deciding that despite it's "plop" nature, it had to be bear (how many deer could have diarrhea at once on the same trail?), I did not think "Oh, the bear is going to get us," or "Oh, I should watch out so I don't walk in all this bear poo." Instead, I thought, "Oh goody, moldy bear scat! That will be a great addition to my fungus and decomposition lecture!"