Years ago, I became President of a non-profit and my friend and former President took me to dinner at an Italian restaurant. After dinner, he ordered two Fernets (one each). The waiter took a step back, looked at him differently and was clearly impressed. That made me impressed too - at least until I tasted it. Worst thing ever.

He told me it was actually a digestif - meant to help you digest your meal. Maybe it works by making you throw up everything you just ate!