From the mouths of babes...

When the kiddos in my care celebrate their birthdays, I let them choose two friends to help bake their birthday cupcakes.  Yesterday was L.M.'s birthday, so he was cooking with friends.  Everyone puts in a couple of ingredients: 3 eggs, oil, water, packaged cake mix.  When it was time to put in the oil, T.B. asked, "What is oil?"
The birthday boy responded, "Dude, it's that stuff you put in your car."