In the earlier days, reaction videos mainl … In the earlier days, reaction videos mainly were intended as a [[troll|prank]] amongst friends/family who would show an unsuspecting victim a "[[Goatse|cool website]]" and would record their reaction to upload on YouTube or some other video sharing service. One of the first of these to have gone viral were videos of someone playing that [http://www.scarymazegame.biz/ Scary Maze] game, and a [[screamer]] would pop up, scaring them to death.
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From there, many followed in suit to prank their friends with whatever prank they could acquire, whether they were screamers or shock sites. As with anything coming from YouTube, once others were aware of it, they began to plot their own reaction videos in hopes of reaching attention and many views. Soon enough, rather than to be pranked (while most "pranks" were fake) some decided it would be just easier to do a video by themselves, by entering a shock site and recording their reaction to it. The authenticity of many of these videos are reasonably questionable; some are easy to be determined as fraudulent while others seem quite convincingly real. Either way, to those that matter, the videos usually hold no concern.
Though, typical of many YouTubers, some decided it would a much simpler process to steal reaction videos with over 100,000 views and claim them as their own (much like when any other trending video with a lot of views are uploaded).
===Non-Shock Reaction Videos===
Of course, shock content wasn't the only thing people would post their reactions to. There would also be particular videos, such as normal viral videos, politics, current events, etc. in which people would post a video citing what they felt about the particular subject. These would include peoples' opinion, bringing out [[pseudo-intellectual]]s and faux social activists alike in hopes of ''educating'' people.
Not all reaction videos on YouTube consist of people freaking out to images of grotesque fetishes of bizarre and disgusting sexual activity and/or gross out images. As [[4chan]] culture became more mainstream on the internet, so did their [[memes]] and in-jokes. Some reaction videos, which would be ripped from media such as popular TV shows, games, etc., would also be used as a substitute, or a better alternative, when one needed a reaction image, or in this case, a reaction video. Such examples include [[Nope.avi]], which became not only a popular reaction video, but a meme as well.
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This variety of reaction videos are usually quite short, most being less than a minute long in duration, being straight to the point. in duration, being straight to the point.