Everyone could see and hear the constant flurry of activity from the houses being built behind our house. We could watch everything from our patio. The workers would quit about 5 pm and all would be quiet and still again. My boys were 6 and 8, and asked if they could go play in the dirt piles. I guess that would be OK. About an hour later my 6 year old son runs in the house yelling for our attention, (he is very calm in a crisis). He said, " Help! The bulldozer we were playing on had a key in it, and Mikey (the 8 year old) turned it and started it!"