wow, thats so cool that Derren is a Penn & Teller fan! I'm a massive fan of their work, I dont know many people that actually know who they are. I watched the invisible thread thing, and I do the same trick on my 6 year old brother. he believes the strings there when really I'm just simulating string being stuck on to a piece of card. him being a six year old takes the accomplishment out of it though, ha ha xD ...