The joy of watching someone unknowingly eat something they're going to regret eating is such a weird pleasure like no other that there's probably a German word for it.

When a game comes with a spit bucket attached, you know you're in for an uncomfortable ride so props to Sienna Miller for playing along in this increasingly gross game of 'Secret Ingredient' on 'The Tonight Show' last night.

Jimmy, Miller and chef/TV personality Anthony Bourdain had to take turns guessing the unusual secret ingredient hidden in each course of a three-course meal and while it wasn't 'Bush Tucker Trial' levels of gross, it certainly wasn't pleasant.

Miller's face above says it all really.

We have a feeling this is a game that Fallon is not going to be playing again with his guests any time soon.