Have one on me!

A bunch of my friends were out and having cocktails when this was placed on the table.

What the hell?

You can tell a lot about your friend's personalities by their reactions.

• "Gross!"
• laughter, and more laughter
• indignation
• "Oh, my gosh, it was probably that fly's best moment"

Or would you be like me, and insist that the waiter leave this drink on the table while he got another from the bar = suspicious and distrusting.