A nasty bug is a bug that is difficult to reproduce, typically for the following reasons:
  * It occurs with a particular OS, version of the OS (see [[http://wiki.ptidej.net/doku.php?id=java_class_process|this bug]]!);
  * It occurs with a particular version of the JVM or JVM implementation;
  * It involves multiple threads and data race / deadlocks;
  * It requires lengthy computations;
  * It happens only when the [[http://www.phdcomics.com/comics.php?f=821|prof. is there]] ^_^

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