"Wait! Maybe the bulb isn't broken. Let's try it again."
"It's in the manual. Didn't you read the manual?"
"The bulb was fine; you just forgot to turn the switch on."
"The light bulb doesn't work? You must be using a non-standard socket."
"Well, we have an exact copy of your light bulb here and it seems to be working OK. Can you be more specific about the exact problem?"
"Our engineers are busy at the moment... We have assigned query number 987632 to your question. Please refer to it in all future correspondence."