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With silicone caulk, tinfoil, and some paint you can make a pretty convincing brain in a jar for a lab scene or a testing facility.
the caulk-http://www.homedepot.com/p/DAP-10-1-oz-Aluminum-100-Silicone-Sealant-2-Pack-207561/203661703#.UgOE5ZKshFA
where I get my Jars- http://www.bottlestore.com/1-gallon-wide-mouth-plastic-jar.html