Captain America: Civil War, airport fight scene...Cap's team needs a distraction, something big. Scott promises he can do it...jumps onto Rhodey, pulls up his arm gadget, slides it from red to blue...and it was in that SPLIT second that it all suddenly clicked into place for me as I realized what he was about to do.

The moment he turns into Giant Man my deduction got paid off gives me thrills every single time I rewatch that film.

And of course Portals...nothing beats Portals.