Hey! Hello! We accept your challenge! Look what we can do! And you are weak? What can you do? What are you doing? Do you have a video confirmation? Do not you know what "Challenge" is? This is a task that you need to perform and shoot a video to it.
Challenge is a test, a game of something. For example, someone went through some kind of obstacle, ate something or poured something on himself, after he makes a call to someone to do the same thing. All this is called Challenge.
Recently there was a very popular session to pour cold water on yourself, now it has passed and a reference is called either trying to taste some kind of new food for yourself, or something like trying a new one. And now we will paint your lips with blindfolded eyes.