Great for audience interaction!
I had a show recently and closed it with this (it was a Valentine's day party) and it killed. The great thing about this trick is that it gets your entire audience involved. The only reason I gave it 4 stars instead of 5 is because it's not infallible, some spectators can (and will) mess it up. At my show, I had about 5 people who didn't get the match to their card.
Now, as I started this routine, I told everyone that this was going to be amazing IF they watched me closely and followed all of the directions. I jokingly told them that if they didn't, it may not be so amazing. I did this to try and mitigate anyone feeling bad for not getting it but the majority of the audience got it and the ones that didn't all saw that most did so it's fine.
I was kind of on the fence as to how much of an impact I thought this would have with an audience. But then I ran through this thing with Woody as he suggests in the instructions and when I got to the last card, I couldn't believe it worked and said, "That's my new closer for this next show!"
