If you have both a toddler and a really loud clanking noise coming from your dryer, there is a 60% chance that your toddler left a rock in his/her pocket and a 30% chance that the rock was in YOUR pocket because your toddler gave it to you for safe keeping.

I have three rocks on top of my dryer now, and the above statistic illustrates why they are there. I could toss them out in the alley, but the 2-year-old clearly saw some value in them, so I feel too guilty to do that. Thus, for now, they live on top of the dryer.