So, this guy walks into a bar in Londonderry, NH and runs up a tab of nearly $40. But he doesn’t leave a 15% tip, nor a 20% tip; he’s a big splendor with a heart of gold and so he left a 40,000% gratuity [40 thousand percent], reports the Association of Mature American Citizens [AMAC]. Michelle McCudden was the bartender that day when her unidentified “mystery man” stumbled into the Stu...