Reaction videos are videos posted in forums typically as a response to the OP.

They are usually short sentences or phrases taken from a larger video (popular movies, tv shows, YouTube videos, etc.) that express emotion in a similar fashion to reaction faces.

Dramatic Chipmunk (a.k.a "Dramatic Prairie Dog") is a short video clip featuring a sharp-eyed prairie dog from the Japanese TV Show Hello! Morning. Since its upload via YouTube in June 2007, the animal became most notable for its dramatic expression and theatrical demeanors, in similar vein to OMG cat and Inception cat.

The Technoviking was made famous due to a video that included a blue-haired girl dancing, then being crashed into by some unruly man during the Fuckparade 2000 (a techno street-parade in Berlin Germany). This caused Technoviking to forcefully grab the offending man by his arms and shove him back into the crowd. Technoviking then pointed at the man and gave him an extremely fierce gaze. An aura of dominance emanated from Technoviking, causing the man to step down from confrontation. Technoviking then started dancing wildly through the streets after being handed a water from one of his many dancing minions.

LOLcats are a series of image macros consisting of humorous photos of cats with superimposed text written in a form of broken English known as lolspeak. For the caption, white Helvetica font is widely used as the de facto standard.

Lauren Caitlin Upton is a beauty queen from South Carolina, US, who is best known for her incoherent response to a question asked during the Miss Teen USA 2007 pageant.

I Like Turtles is a popular catchphrase uttered by Jonathan Ware, a ten-year-old boy who was visiting the Rose Festival in Portland, Oregon on May 31st, 2007. While at the fair, Jonathan had his face painted to look like a zombie and soon caught the attention of Nancy Francis, a local news correspondent for KGW NewsChannel 8. But when Nancy approached the boy for comments, Jonathan's face-paint was the last thing on his mind--because Jonathan likes turtles.

One-Take is a genre of online videos produced in a single "long take," typically featuring an action sequence or a performance routine that is shown continuously without any cuts in between.