The IRON ,,,,, I had good friends working behind the camera during that TRAIN scene from ONCE UPON A TIME .... and that scene was all improvised (not scripted) by each of the actors.
I believe that it was Jack Elam who came up with the buzzing fly and pistol idea. Or was that Woody Strode?
And that harmonica tune is still inside my head!
Another great but little scene in ONCE UPON A TIME IN AMERICA was the scene in which the young kid is sitting with a cupcake in his hand waiting to give it to possible his girlfriend who is in the bathroom.
No spoiler given.