I had a really weird and worrying problem today. In preperation to reimage an IDSM2 module in a Catalyst 6500 with SUP720 and IOS 12.2(18)SXF3 I sent the "hw-module module 5 reset cf:1" command in a telnet session to the switch.
This caused the switch to drop from the network and when I was able to set up a serial connection to the switch I found the SUP720 had rebooted into ROMMON.
The SUP720 is in slot 7 and the IDS in slot 5. Neither buffer log or syslog show any indication of what happened and I'm positive I sent the correct command.