In January 1962, three girls at a mission boarding school in Kashasha, Tanganyika, started laughing. They couldn't stop.

Add Yahoo as a preferred source to see more of our stories on Google. Welcome to another weekly roundup of Reddit's funniest signs! We pulled some absolute gems from this week, and we also love ...

The symptoms: The woman visited a clinic because she had long experienced bursts of uncontrollable laughter, which doctors described as "mirthless" in a report of her case. According to the patient, ...