a lid
When you're trying to explain how to open a jar to your starfish friend, who looks like they just got dropped from the sky.
I tried to explain how to open a jar to my starfish friend, and it was like trying to teach a dog to fly.
My friend is a starfish, and I had to explain how to open a jar like it was a foreign language.
I tried to open a jar with my starfish friend, and it was like a conversation between two broken phones.