4chan Party Van
From lurkmore wiki
4chan Party Van
First seen in a MSPaint comic. Anonymous answers his door after the person knocking claims it's the "4chan Party Van", but unfortunately it turns out to be the FBI, who proceed to exclaim "LOL J/K" and beat up Anonymous.
4chan Party Van is now used as a euphemism for "FBI", often posted during child pornography floods; became extremely popular after the "Jake J. Brahm" incident, where /b/ became aware actual FBI agents might be monitoring their chaos. This newfound knowledge both excites and terrifies many /b/tards.
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One of many images of the 4chan party van
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Very serious business requires serious ID