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How limber wasGilmore Girlsactor Sean Gunn as a child?

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Jay Maidment/Disney

Three decades on, Seans flexibility has proved of huge value to his sibling.

I can crouch down and even walk from that position without too much trouble, says Sean.

I dont think many other actors would be able to do the physical part of it.

Sean can thank or blame a certain sandwich-loving dog for his discomfort.

I wrote the Scooby-Doo movies, says James.

Id been through having Matthew Lillard [who played Shaggy] act with a tennis ball.

I knew I wanted a real actor to play Rocket.

When we rehearsed the first scene, I just jumped in there, says Sean.

Joe and Anthony were like, Were going to stick you in there with the cast.

But I never did the job because I thought it would get me a lot of attention.

I did the job because I wanted the movie to be as good as it could possibly be.

But yes, thats true.