"Mommy, my pee pee turned black."

Wha...what?! What does that mean? I don't even know what to say to that. Did I hear you correctly? Did you just calmly say to me that your penis somehow turned black? Like a fungus? Or you got marker on it? Or you managed to bruise it (is that even possible?!)? All of the previous thoughts came streaming through my brain the instant I heard my almost 10 year old say these extrememly strange and disturbing words to me. I was brushing my hair and he was peeing in the toilet (not sure why I felt the need to specify that part). I froze for a second and just murmured something like, "Um...what did you say?" He repeated his statement and added that it looked like there were fuzzies on it too. OH!!! Now it makes sense - he had just gotten new underwear earlier in the day, black ones, and had been playing outside. Whew, I felt soooo much less freaked out. I explained what it probably was and he just shrugged and said, "Oh, okay," and walked out of the bathroom. I was glad we had gotten to the bottom of what could have been a most perplexing situation. But then I started wondering why he wasn't the least bit shocked...