From laughing fits to awkward falls and unexpected reactions, these clips show how one person losing control can make the whole moment even funnier.

Uncontrolled laughing or crying can be more than just a surprising emotional reaction, it may signal a neurological condition called pseudobulbar affect (PBA). PBA causes sudden, involuntary emotional ...

I don't think I've ever laughed harder than during a church service, when something faintly ridiculous caught my eye. My friend saw it too, and once she started laughing, it became impossible to stop.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The symptoms: The woman ...