Thought I'd try this as a post:
In another thread (see 'Michael Weber effect') - I've described an incredible effect that I saw Michael Weber do a number of years ago. It was a matrix effect - except that, instead of loose coins being moved around under the cover of two 'covers' - it was nails hammered into a piece of wood! Discussion with several people who were at the same 'viewing' as me drew a blank - no-one knew how it was done. Similarly, I got the impression from the posting on this site, that other people who have seen this effect have also been completely fooled.
While we run the risk of over-enhancements / over-embellishments being (innocently) made......what effects have you seen that completely fooled you and you've never figured them out?
(I can imagine that this could spurn quite a few effects with people working out a multitude of solutions. Once the 'plot' has been set - the methods will generally follow).