I am allergic to coffee. Recall a flight LHR/ABN. It was first of the day and BMI were boasting of their new breakfast service in Club. This included serving large mugs of freshly made coffee that was meant to be as good as filter - without having the filters on the a/c.
Normally, I can get away from the coffee smell if it is stoo strong but the bloke next to me quaffed his ten gallon (it seemed to me) bucket of coffe and smacked his lips - turning to me to tell me how wonderful it was. Then noticed I had the fine cotton napkin across my nose and mouth ... I explained that he had better keep the coffee away from me, to save me the trouble of redispensing my breakfast over him.
Looking through the suggestions on the link - I could tell stories about some of them darned kiddiwinks.