I purchased the "No Button" a few months ago at a Hallmark store, and surprise students with it every so often to be a little silly.  It really makes them laugh when they ask a question such as, "Can I please have more paint" and they hear the button say, "No"!  

Mr. Botello's class and I have shared laughs over the "No Button" before, but today, I let them use it with each other for a minute or two while they were waiting to go to lunch. 

Mr. Botello arrived to pick up his class and played along with us!
It's so important to share laughs with our students.
The "No Button" is certainly great for that.