"Who's Elvis?"

The boys and I were sitting around the kitchen, finishing lunch and listening to Christmas music. "Rudolph The Red-Nosed Raindeer" was playing and Brock started shouting out the traditional echoes between phrases...
"Like A Lightbulb!"...
"Like Monopoly!"...
At the end of the song when it says, "You'll go down in history", Brock shouted, "LIKE ELVIS!"
Austin and Brandon looked at him strangely and asked, "Who's Elvis?"
Brock thought for just a split second, then confidently replied, "He was one of the presidents!"