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A thoroughly annoying [mobile phone] [ringtone]. It sounds like a sort of musical [warble], almost like a sparrow, followed by a loud, metallic bang. Not quite like a [gunshot] or [explosion], more like the lid of a metal [trash can] being slammed. All I can think of when I hear it is some idiot chasing a sparrow around with a [pot], and finally managing to catch it.
For some reason, this is almost as popular with the high school crowd where I'm at as the obnoxious [near-ultrasonic] ringtone. (The one that people over 30 supposedly can't hear. I'm almost 30, and I can hear it keenly, so can most of my friends, between 25 and 35!)