Luke: "Mommy, you come play trains with me?"
Mommy: "Sure. After I finish feeding Silas."
Luke {in the process of running upstairs}: "Okay. You finish Silas. I go upstairs and wait for you."
Mommy: "What are you going to do while I feed Silas?"
Luke: "Yell for you."

{about 2 minutes later} "Mooooooommy! Come up! Mommy! Come up, Mommy!"

- Luke, a man of his word