"I don't know, I wasn't wearing your pants"

It was time to go to the gym that evening and my oldest son, for some reason that I now can't remember, had taken his pants off. It made sense at the time. Anyway, we were all about to walk out the door and he had been asking and asking if anyone had seen his pants. He finally got to me and those words just flew out of my mouth. I heard my husband give a little chuckle/gasp, but we just kept moving. I mean, honestly, if you take your pants off shouldn't you know where you put them?