One back-to-school activity I love for middle or high school students is Meme Wars. Using Jamboard helps students practice tech skills AND respectful collaboration practices, and using this activity at the beginning of the year allows you to get to know your students, introduce them to the classroom norms, and share some laughs with them.
 
Who doesn’t love a good meme? And while the picture itself counts towards the hilarity factor, the *caption* is what truly makes it or breaks it. In this activity, I've preloaded a different meme (or basically, just a funny picture) onto each Jamboard slide (5 total).
 
I also left a few blank ones for you to add your own images :)
 
Instruct your students to add the funniest (while appropriate - make sure to emphasize this lol) captions they can, using the sticky note feature. I also suggest telling them to add their initials to the captions they add. Each student should submit at least one caption, being mindful of others’ work, and at the end, the class can vote on their favorites.