Slaters poignant, career-shifting performance is reminiscent of Burt Reynolds inBoogie Nights.

But another unexpected reference point was in the actors head while on the set.

And it slipped out a couple of times.

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I just found out that theres an outtake now where I did a full-on Ethel Merman impression.

Maybe itll be on the bonus reel, Slater says.

That was full-on improv.

And I had that song somewhere, easily accessible, in my brain.

And really, I felt like Mama Rose and he felt like Gypsy Rose Lee.

And I was excited and he was my star.

So I was just like, oh well, Youll be swell, youll be great!

Gonna have the whole world on a plate!

Everything is coming up roses!

So youll have to wait for the Blu-ray release to potentially see Slater belt out that tune.

Check out forKing Cobrabelow.

The film is in theaters andavailable on demand now.