Is it the central heating or can I hear something in my ear, or is it like morse code?

Question

esshotwired · Answer

what??

anonymous · Answer

You know that soft, ringing sound you hear inside your ears when everything else is completely quiet? 

If you can hear it, then you're safe. 

But when that sound goes quiet, it means that they've noticed you.

esshotwired · Answer

wait...who would notice you if the noise stopped?

anonymous · Answer

^ You must be lots of fun at parties.

anonymous · Answer

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