Laughing Babies

Today, at exactly 5:28pm, a baby's cackles roused me from a klein tucci (little nap).  Her father must've been doing something hilarious.

When I listenened more closely, it became obvious that her father was pretending to be a dog.  His commitment level was low.  This baby was laughing at something it didn't find hilarious.  She just wanted attention.

Therefore, I hereby postulate a hypothesis.
Laughing too hard is a learned behavior.  
Although many individuals lose (unlearn) this behavior over time, many don't.

Drunk girls at bars do the same thing.  They laugh too loudly for attention.  Drunk girls are, quite simply, big babies.