Hark Sei Ngor

Hark Sei Ngor means scare me to death in Cantonese.

I was testing a stack of computer power supply unit.
When I turned on one of them, it exploded.
Audio and visual effects are similar to a firecracker.
Lucky no one was injured in the accident, MMU's circuit systems are as usual and the wall socket still funtion well.
The only casualty is that power supply.

So class continues as usual! =D