This homemade railgun by Ravi Gaddipati may look small compared to this monstrosity, but it still packs a respectable 5.6kJ; "the enclosure is made of Garolite - G11, courtesy of CCT Plastics." Video after the break.
The rail gun seen in the video below is only the first revision Ravi Gaddipati's project. The next one will be capable of "forty caps each rated at 400v and 3900uf."[via Gizmodo]