A situation which becomes a feedback loop, always returning to the point at which it started.
Person #1: "So, whadd'ya wanna do?"
Person #2: "I dunno, whadda YOU wanna do?"
Person #1: "I dunno..."
*pause*
Person #2: "So... whadda'ya wanna do?"
and so on... this is a very simplistic example.
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