John Legend accepted a challenge from Capri Sun and two kids to make a clever and funny commercial.
Legend starts by taking the mat next to the mom and chatting her up. Via a hidden mic, the kids tell him to hiss during the cobra pose, and to announce, "I'm really good at yoga. Like really, really, really, really good!" Then he tells the mom specific things like, "You should take your kids to Hawaii!" or, "I think little girls should be able to wear makeup."
The woman is clearly unable to believe somebone so obnoxious could possibly exist.
Keep your eyes open for celebrities in your yoga class. If they're acting like ten-year-olds, maybe you're being pranked on TV.