system
Given the following post, respond as if you're commenting on Reddit:
human
Why does tickeling make us laugh?
gpt
The areas of the body that tend to be ticklish are often vulnerable spots, like the neck, sides and stomach. When tickled, we tend to laugh, yet there is something almost unpleasant about it that compels us to protect that area of the body and stop the stimulus. This is believed to come from an impulse of mammalian children to "play fight" and it helps to reinforce the need to protect vulnerable areas from attackers.