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Along with paranoia, ninjas-on-the-lawn is the most common side effect of cocaine.
asshole: "What is that outside?"

you: "I'm not sure, but i think it could be NINJAS."

asshole: "There are no ninjas on the lawn."

you: "OF COURSE THAT'S WHAT THEY WANT YOU TO THINK; THEY'RE NINJAS."
by SnowhuouV October 23, 2012
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