20 Things You Somehow Missed In Super Mario Bros: The Movie
2. Lance Henriksen Coughed Up Rice Krispies As The King
At the very end of the film, once Koopa has been defeated and transformed into primordial soup, the King is reverted back to human form from his devolved fungal status.
And so, we get to see Lance Henriksen on screen for a few scant seconds as he hacks up a lung while the final vestiges of his fungal self disappear.
The King ends up sputtering a bunch of non-descript matter on the floor, an idea that was apparently suggested by Henriksen himself.
The effect was amusingly achieved by having Henriksen simply hold a bunch of Rice Krispies in his hand, which he then pretended to expectorate from his mouth. Sometimes the simplest effects are the best ones.