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A stupid, colorful excuse to stop talking about something stupid. You shout, 'I found a purple rock!' to make people forget what they were arguing about. It’s like throwing a sponge at a screaming match.
'I found a purple rock!' said my mom when I brought up her old fling.
'I found a purple rock!' yelled my cousin when I said his pet llama was fat.
'I found a purple rock!' blurted my teacher when I asked why we had math on Friday.