To make sure your house is properly secure?
My friend woke up this morning to find his house had been burgled. They took everything, including a lot of expensive recording equipment he uses for his business, his computer, TV etc.
The most terrifying bit is that they broke in whilst he slept and ransacked the place.
He's been told by the police that they drove a screwdriver through the lock of his UPVC door, which is easy and silent.
It's the kind of thing you never expect to happen to you or people you know 
I know that my parents have similar doors, as do many of my friends so just posting on AIBU for traffic to ask people to check their security and clearly scumbags will seize any opportunity.