NCSA Mosaic 2.0 and earlier allows local users to cause a denial of service ("remote control" outage) by creating a /tmp/xmosaic.pid file for every possible PID.
http://openwall.com/lists/oss-security/2014/05/07/7
http://lists.gnu.org/archive/html/emacs-diffs/2014-05/msg00057.html