Any cocktail with Gin in it.
I arrived in Mauritius to work a few years back, it was a long flight and once we had dumped our cases my colleague and i headed for the bar, as you do. Why oh why we did it but we thought we would work our way through the cocktail menu as we had a day off the following day.
I had a dreadful night but crawled into bed around 5am.
8 am we get a phone call from the people we were there to see. They had arranged a welcome meeting and lunch to start at 10am as they thought we would be twiddling our thumbs and be bored.

it was not pleasant