Inspired by Nick Trost and Peter Nardi, The Sign is Liam Montier's Star Sign Revelation. It's difficult to imagine a more direct method for revealing this personal information about any spectator you meet!
There're no anagrams, memory work (you don't even need to know anything about the signs!), no rough and smooth or sticky stuff.
To begin, you remove a packet of gorgeously designed and specially produced Zodiac cards, all before asking a total stranger what their sign is. The card bearing their sign is removed and placed in full view on the table.
The other cards are displayed, and they all have blue backs...
Astonishingly, the one bearing your spectator's star sign is turned over (ideally by the spectator themselves) and turns out to be the only one with a red back!