I like to do the following assignment when I have to be out, as a sub plan. It keeps student's attention, and these videos will provoke some interesting ideas. I have my students watch two of each kind of "modern art opinion" videos; two pro and two con. Compare and contrast writing is an important skill at all levels of education.
The question they are to answer is, "Is modern art really art?" You could also have a poster available of a famous work of abstract expressionist or minimalist work and students write a written argument on whether it is art or not using information provided in the video. You could also "make" a work and have them write about that based on the video's information posing the question, "Is THIS art?"
Three anti-modern art videos:
Video 1: When did this become art?
Video 2: What is Art? (Makes a joke of "modern art")
Video 3: Why is modern art so bad?
Three pro-modern art videos:
Video 4: I could do that. PBS Digital (PG Content, Please Preview)
Video 4B: Another response. (Okay for every age)
Video 5: Minimalism (vs Abstract Expressionism) includes one "bleep" but they don't say the word.