Interesting or Interested?

I'm just loving Vicki Hollet's videos. Have you checked them out yet? I posted about the difference between American and British English here. 

Here's a great video on the difference between interesting and interested. It's a great example for the difference between adjectives ending in -ing and those ending in -ed. Who hasn't had a student write/say "I am very interesting" or "I am very boring"?? Of course we English teachers understand what they mean, but we definitely want to make sure students don't say "I'm boring" to new friends! How do you teach the difference?

Image via www.jaymug.com

Confession: I didn't know how to explain the difference between adjectives which ended in -ing and those ending in -ed until I went to grad school (Thanks, Dr. Spruiell)! Of course I now know -ing is used for describing other items and -ed describes how people feel. I don't think native English speakers can automatically understand this any better than non-native speakers. What do you think? Was I just behind the curve??