Why are we Ticklish? [Science Video] Why are we ticklish? And did you know that “ticklishness” is composed of two phenomenon? Knismesis, which all animals have, including us, and gargalesis, which only affects primates. [SciShow] Sharing is Caring:FacebookTwitterEmailMorePinterestMastodon Geeks are Sexy needs YOUR help. Learn more about how YOU can support us here.