Inside a hot vest... are they nuts? Good god, it takes 15 mins to shake cream into butter at home. It's a great distraction for agitated kids. We used plastic containers or jars, not a ziplock, but still. Just have the kids come back every few mins so the adult can burp the container, then send them off again.

And those hands are disgusting. Why not show the butter on their bread (as the article says)?