If you could insert yourself in a single movie scene as a joke, which scene will it be?

A suicide bomber with a lengthy background story that plays for nearly 1 minute, and then blowing up in 5 seconds without hurting anyone.

“I’m not Spartacus!”

I’ll be the one who points up into the sky and shouts “Look!” Whether it’s Superman, or a UFO, or a ball of flame, it doesn’t matter.

Oh, wait—as a joke? Ok, I’ll point up into the sky and shout “Look!”, only there won’t be anything there.

I’d drive a taxi in Midnight Cowboy – “I’m driving here!”

In E.T., when the alien raises its glowing finger, I would stick my head through the door and say to the kid: “You gonna get anal probed!”

In The Godfather, I’ll be sitting on the toilet with the door locked repeatedly telling Michael “Sorry, I’m not done yet.”

And once he loses patience banging on the door I’ll say, “Oh wow, what’s this, a guuuun? Oh shoot, I dropped the bullets in the toilet! Awww, but I haven’t flushed yet.”

From Office Space:

Joanna: You know what, Stan, if you want me to wear 37 pieces of flair, like your pretty boy over there, Brian, why don’t you just make the minimum 37 pieces of flair?

Stan, Chotchkie’s Manager: Well, I thought I remembered you saying that you wanted to express yourself.

Joanna: Yeah. You know what, yeah, I do. I do want to express myself, okay. And I don’t need 37 pieces of flair to do it.

[flips off Stan and walks out]

not the funniest in cinematic history, but it always makes me laugh in context of the movie.

Stepbrothers, tree house scene, I get to punch Derek.

In Goodfellas I would join the table and whisper in Joe Pesci’s ear that Ray Liotta just told me that he indeed thinks he is a clown.

Sneak up to Audrey Hepburn in Wait Until Dark & squeeze her pert boobs.
They make that delightful parp sound & she jumps like the world champion blind lady she is.

In The Great Race – the pie fight. link

It would be so much fun to be in an all out pie throwing free for all.