In case you haven’t you can watch it here:

So if you watch the sneak peak you’ll notice our lovely Karen look off to the screen and start laughing around 17:06. (Followed by my cackle lol)

That’s because Anne and I were doing this:

Well… it wasn’t as cool as this one because it was a 2 person train and we haven’t perfected this skill yet…

But hey, it got the job done. She laughed. Hehe
Sorry for trolling you Karen :p