[not really sure how this goes under the general topic of "Finger/stage manipulation", because it's a purely mechanical prop, not what we'd typically call "manipulation" magic , but I'm sure some moderator will move it if they see fit ... ]
The PSYCO-CAN-ESIS effect by Mark Kornhauser plays very funny and from a reasonable distance it can also be a fooler . (not a close-up effect, imo) The problem with the prop in it's currently available form is that the gimmicked Coke cans were made using an older model Coke can . Coke cans (and other soda or beer cans) don't look like that anymore.
For compartison see : [url=http://www.h2o-ci.com/wp-content/uploads/2012/04/coca-cola-can.jpg]Modern Coke Can[/url] vs. [url=http://www.usasoda.com/images/coke27.JPG]old style Coke can[/url] from late 1970's - early - 1980's . The PSYCO-CAN-ESIS prop looks like the old style can.
I still see [url=http://www.seomagic-usa.com/catalog/advanced_search_result.php?keywords=PSYCO-CAN-ESIS&x=0&y=0]some dealers selling the old model[/url] , so I guess someone got stuck with a warehouse full of these things with the late 1970's-early '80's Coke can design. Probably coming to the end of the existing stock now ... most online dealers have it marked as "unavailable" or "discontinued" . It would still be a nice effect if someone would make it up to look like a modern Coke can or Beer can.
I remember reading on [url=http://www.themagiccafe.com/forums/viewtopic.php?topic=191894&forum=109]another thread[/url] about this trick it was suggested that a modern version of the prop could be made using a scanner, an ink jet printer and glossy vinyl printer sheets.
I tried this, but didn't have much luck with getting a good looking prop that would crush and uncrush . Maybe I used the wrong kind of printable vinyl sheet material. The other issue was that the vinyl sheet needs to be shaped and attached to an upper and lower metal portion of a modern can which is [i]curved[/i], not straight-sided as on the old style can. So getting an exact color match to the metal can is difficult. If the printed vinyl sheet didn't need to match up to the metal upper and lower curved parts of the real can , then it would be easier to make the prop as a straight-sided sleeve. If someone could fabricate the "sleeve" all from one piece of vinyl or latex that would hold the curved shape of a modern can then it would work. But it's a lot of R & D ... I recently checked with Magic Latex about getting a custom item made (not this) and they explained to me how much testing goes into producing one of their products. They have pretty much stopped taking custom orders because it's not cost efficient for them.
ON the OTHER HAND ... who says the PSYCO-CAN-ESIS effect has to be performed with a Coke can or a Beer can ? What other products come in metal cans that are [i]straight-sided[/i] ? I never use the stuff , but it seems to me that up until recently the Red Bull Energy Drink cans were more or less straight-sided :
[url=http://www.drinkstuff.com/productimg/41009_large.jpg]Red Bull can[/url]
Here's a product that comes in a straight-sided can which would be funny to use for a "crushing" effect :
[url=http://www.speedygrocer.com/wp-content/uploads/2014/01/popeye-brand-spinach.jpg]Popeye brand Spinach can[/url]