Easy!
I want to learn when someone loses their train of thought so I can quickly run out of the room, put on a sombrero, get some maracas, and dress up like a Mexican, then get a Mariachi band and go back to the person who lost their train of thought so when they get back on thought, they just find me and a
whole Mariachi band playing some Mariachi music in front of them to confuse the living Hell out of em', cause why not?!