The radionuklider thereom is a simple 4 step process to figure out the force of Shrek's Fart.
The equation of the first step is:
sf = d+f+sp/ts
shrek's farts = diarrihha mass + fart pressure + overall smell degree / toilet size
The second step is to take that number equivalent and put it to the power of your sheets of toilet paper.
Then square root it by Shrek's shoe size.
Then divide it and then multiply it by your personal likability of shrek on the 1 - 1000 scale.