Kids, meet drugs:
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From here on out, “Eye contact” is the only phrase you’ll ever need to know. Oh, and if I didn’t make it clear, the answer to the title is “drugs.”
For your continued enjoyment, here is a drugged-up naked acrobat attacking a BART station:
Naked, Drugged Out Circus Acrobat Attacks BART Terminal – Today the Internet Wins [NSFW VIDEO?