Holy shit that trick is good. I figured out the marker part (after replaying it a few times). They are right, every part of the trick is perfect. I'm convinced he has an extra copy of the 2nd girl's card. It's possible to do that (when the ink is still wet, you can use tape to partially lift a signature and transfer it to a 2nd card), but that takes a lot of extra time, and he didn't have nearly enough time to do it, and I don't know of any serious magician who does it. It also requires the magician to quickly find a duplicate of the card; it's very impractical. I love Penn & Teller. I consider myself a fan of magic and have learned how to do a few small tricks; though a touch of social anxiety means I've rarely performed them, and haven't built up the nerves and practice to look really cool doing it. I can figure out most tricks to one extent or another, or at the very least I can tell when and where the secret part happens even if I don't know the exact mechanics of it, but Penn & Teller's bullet catch trick has me stumped. I'd love to see them do it live. My favorite trick from Fool Us (I've only seen the first season) is the one with the cards and the box, https://www.youtube.com/watch?v=YjiTAkKhG28 and my second favorite is the one where the guy put the cards back into a new package. My all-time favorite card trick is Granpa's Aces by David Copperfield: https://www.youtube.com/watch?v=eyB6FMrgvOo He times it with the music perfectly, and in his hands it is an artwork.  The most impressive trick is Oil & Water by a 1-handed magician: www.dailymotion.com/video/x22yew_rene-lavand-oil-and-water_news Yes, a 1-handed magician can perform spectacular slight of hand. I've figured out that trick, except for the very end, which still gives me a "WTF?" moment. I've watched that trick at least 100 times, in 3 separate videos.