Raising the alarm

I'm sure alarms are included in a fair few roguelikes, and if not they should be. A simple thing like having to fell a monster before he calls his mates, or drawing a tough beast to one side of a level while you sneak down a side passage adds a great deal of immersion and drama whilst playing.

So far I have only thought of a few objects to act as alarms, bells gongs and horns. If I can think of more i'll add them.

Drums....that didn't take long....