pretend – v. to act as if something is true when it is not true
prank – n. a trick that is done to someone usually as a joke
prankster – n. a person who likes playing pranks.
get in on – phrasal verb. to become involved in
catch on – phrasal verb. to understand what is meant or how to do something.
viral – adj. relating to or involving an image, video, piece of information, etc., that is spread rapidly and widely from one Internet user to another.