article_snippet.sent: The method - one this journalist won't be road-testing - works by way of the airlock created in the opening of the glass or jar, which increases blood flow to the lips and causes them to swell.
article_snippet.sent: The reportedly painful method involves participants placing several people mouth over the opening of a cup, jar or shot glass and sucking in until the air vacuum causes several people lips to swell up .
article_snippet.sent: The reportedly painful method works by way of the airlock created in the opening of the glass or jar, which increases blood flow to the lips and causes them to swell .
highlights_snippet.sent: Method involves creating an airlock which forces lips to swell .
  