That's the entire joke. Actually, it's not a joke... it's a knee jerk reaction to the word Boston from a guy with no creativity, no standards for humor, and who has probably never been to Boston. This was a moderately funny schtick when Drew Magary started it like 6 years ago and has since had every last drop of blood sucked from its carcass. JustinJump is taking a hack at a pinata that was busted, raided and cleaned up years ago. He's swinging at a rope hanging from a tree branch.
Enough of this joke. Enough.
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