Why We Do It
The reason for the glass is simple: It is a 100% reliable, zero-battery alarm system. In the world of security, this is known as a “noise-maker trap.” The primary goal isn’t actually to stop someone from coming in—a determined intruder can still push through—it is to strip them of their most valuable weapon: The Element of Surprise.
If someone tries to enter while you are asleep, the sound of the glass hitting the floor will wake you instantly, giving you those precious seconds to react, yell, or call the front desk. More importantly, it terrifies the intruder. Someone sneaking into a room wants to remain undetected. The sudden “CRASH” of a breaking glass tells them that their presence is known and that you are now awake.
In most cases, an intruder will flee the moment the glass drops. They don’t want a confrontation; they want an easy target. By hanging a cup on your door, you’ve turned a standard hotel room into a high-stakes environment for a criminal. It’s the cheapest insurance policy you’ll ever “buy,” and it ensures that if the door opens, you’re the first to know.
Don’t miss how to do this for the best results on the next page…