This is one of the more practical of the Coffeehouse Conjuring tricks Greg & Dave and been putting
out. It has lots of plusses and no minuses.
1) It's truly impromptu. The prep work takes
literally just a couple of seconds. You could probably even do the prep work out in the open as
long as no one is paying attention to you during those few seconds.
2) It's very easy. No
slights. No lapping. Can be done sitting or standing. Could be done naked. (I don't suggest
performing naked near hot coffee.)
3) It's very quick. While this may not be a reputation
maker, it's should surprise people.
4) It doesn't have to be performed at Starbucks... or even
in a coffeehouse. It can be done anywhere where there's coffee supplies.