jargon.artrocity.com
New Hacker's Dictionary the Jargon File v 4.4.6
[TMRC] The elementary particle carrying the sinister force. The probability of a process losing is proportional to the number of psytons falling on it. Psytons are generated by observers, which is why demos are more likely to fail when lots of people are watching. [This term appears to have been largely superseded by bogon; see also quantum bogodynamics. —ESR]