I was watching some of Sesame Street episode #3155 on YouTube, and there's a scene where Zoe starts blowing bubbles. I've been wondering about this for a while, and haven't really found a definite answer, but how are they able to do this trick? There's a later instance in #3877 where Elizabeth blows bubbles as well. My guess is that either: A) There's a button on the bubble-blower that the mouth pushes, or B) the blower is remote-controlled. Are there any other possible ideas?