Sometimes, especially during testing of vSphere HA, it can be useful to simulate PSOD (Purple Screen of Death). I did some googling and found the article "What ESXi command will create kernel panic and result in a PSOD?". Long story short, PSOD can be accomplished by following ESXi console command:
vsish -e set /reliability/crashMe/Panic 1Of course, you have to SSH to particular ESXi host before you can run the command above.
All credits go to IT Pro Today article available here http://www.itprotoday.com/virtualization/q-what-esxi-command-will-create-kernel-panic-and-result-psod