Out of all the things that can potentially get labor going, I never would've considered "laughing" as a possible trigger. Yes, laughing, as in funny, ha ha ha, he he he.
Believe it or not, a woman in China, Ma Lusha, actually laughed herself into labor while taking in a comedy show in Beijing featuring a stand-up comedian named Guo Degang last Saturday night. When she suddenly felt the baby coming out, she was taken to the hospital, where she delivered a baby girl.
She was only 38 weeks along and wasn't the least bit concerned about delivering her baby early simply because she couldn't control her giggles. She said, "I love Guo's standup comedies very much. I never missed his shows. My doctor said my expected delivery date was several days later so I felt assured."