[From the Mandelbrot set] A bug whose underlying causes are so complex and obscure as to make its behaviour appear chaotic or even nondeterministic. This term implies that the speaker thinks it is a BohrBug, rather than a HeisenBug.
See also: SchroedinBug.
[Unashamedly copied from: http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?mandelbug]
Page meta: deletion reverted, as unanimous consensus not reached. See SchroedinBug.