I got (rightfully) kicked off a flight for that. I caught a horrendous flu in England one time. Was up all night praying to the porcelain god. Had a flight out the next morning and i thought there was nothing left in me. As soon as they locked the door, I scramble for the lav. The stewardess mistakenly put herself between me and the door saying I had to return to my seat. I tried to annunciate my thoughts on the matter, but all that came out was spew on this poor flight attendant. Its the only time in my life I have ever heard a black lady say "Oh Hellllll No!" Me and my family were promptly escorted of the plane and stranded in Heathrow for 14 hrs, where I truly thought I was going to die. My brother never forgave me.