… what appeared to be a hotel suite in the San Fernando Valley on November 8 when an overheated light bulb exploded, setting off the emergency sprinkler system.

http://www.dailymail.co.uk/tvshowbiz…interview.html

Uhhuh. You mean someone put a 500w light too close to a sprinkler head. The "pop" is likely the glass tube breaking in the sprinkler head by the chemical inside it expanding from the heat.