Idea is to present Past Continuous and show how it contrasts with Present Continuous.

"Homer is running", then "Homer was running" etc.

more scenes added, camera changed to an iphone, looks a bit cooler.

I disagree slide with Bart and the towel could be misinterpreted, use your own discretion.

Wtf. It looks like Bart is touching himself in the second last slide. When you look closely, he's mischievously rubbing his butt against the towel but it's easy to misinterpret - pretty embarrassing for the teacher to have to clarify. I showed this to a class of grade 8s today; I wish I had deleted that one gif. Fair warning.