Here's a little background so you'll understand the videos. Paul likes to make up songs for anything and everything. And you thought that he was just a percussionist. No, he is a multi-talented musician and composer! ;-) Daniel likes to go for car rides, and Paul was getting him ready to go so he made up what has now affectionately referred to as, "The Car Ride Song." Ever since then Daniel often breaks into The Car Ride Song. That will help you understand the other video a little more.
Daniel got a cap gun for Christmas - just look at what the girls taught him: