Bad sign? or good luck?

I just went to the toilet in the office, when I just closed the door....

suddenly, the light went darker
and something fly over my head
and blakkkkkkkkkkkk ......

The light bulb cover which made by steel was infront of me on the floor...

Then, "I nearly die??!!!" came to my mind.

I still feel a bit scared now...
If this thing hit on my head, I think may die in the toilet without any notice!
Somemore, today is friday 5.20p.m.!!!!

God! Am I lucky?