I once had a shit whilst high, a fucking massive one, only half pushed it out before I was too worn out, I had to have a breather for 5 minutes. I must have been on there for 30 minutes it was horrendous.
Prob not the coffee, prob the Mc Muffin that came with it. Ill be very surprised that you went into a Mc Donalds hungover and didnt get any munch, just a coffee. I wouldnt be able to help myself! The smell of all those greasy delights....too tempting!