Alexander de Cova - Lager Switch

This has nothing to do with Lager Beer, but a lot with David Regal. REGAL read backwards is LAGER and that's where the name comes from. David's excellent "Clarity Box" that he marketed was the inspiration, in fact I actually use his box in this video (although you could use any container or suitable drinking glass).
This is my handling with the UNPREPARED crystal box, acchieving the same result: a folded card, which has been in full view inside the box is switched out for a signed card. This is a no-frill switch for the worker with a heavy rentention of vision aspect to it.
Of course, it could be a blank card or business card as well, so this comes in very handy for the mentalist (imagine using this with an index with pre-folded billets, etc.). The possibilities are endless - I have even done it with a folded bill.