6. Failed Fire Alarm
Estimated Cost: $50*
What transpired was that the house nearly caught fire.
A man posted this amusing photo and claimed that this is how he discovered his partner was cooking. Anyone who has ever come dangerously near to setting the house on fire while cooking will be able to identify the malfunctioning fire alarm.
The only silver lining is that actual harm was not done because the smoke alarm detected the problem before it grew worse. Replacing a smoke alarm is a simpler task than repairing a completely destroyed home.