Sam wanted to video him playing the part of it that he knows (for a friend) last night.
If you are quiet, you can hear a couple things in the background. First, the sound of pouring (that's me, pouring Diet Coke into a glass). Then there's, "MOM!" (that would be Jack when he sees that I'm paying no attention to the thing I'm doing [because I'm watching Sam and Joel] and completely over-pouring it). Then there is a splat sound (that would be the Coke hitting the flour) and some laughter. Sorry for ruining the video, Sam, but it's kind of funny for me to have it like this.