If you've seen the show, would you kindly explain my question?
Here is a joke in the episode "The Christmas Picture". It's in a scene when Ray and Robert were thinking about gifts to their mother. And in here, Ray doesn't think mom would like Robert's gift﹕
RAY : Hammock?
ROBERT: That's right, it's the perfect gift.
RAY : Yeah? You really see Mom fighting her way out of a hammock?
ROBERT: Shut up, she'll love it. It's like an outdoor couch..
The idiom fight one's way out/through means "struggle to get out of"
So I don't see the logic in this joke.
Please explain it to me. I want to laugh too.