Carl's Milkshake
While your kid is sleeping, sneak into his room with your wife and start to bone down. If you can finish and yell "CARL" before he wakes up, you win.
We snuck into his room, started pounding it out, and I was like "CARRRRRL!" Then he woke up. It was awkward. And now I'm on a government list. But I got a Carl's Milkshake!