"Yes," you reply, "If it's what those guys were drinking..." You gesture to two well-built lads in rugby kit who have just drained their glasses and are now heading out of the bar.
The bartender glances after the lads. They have their arms around each other's shoulders and are laughing and joking. "Oh yes," he smirks. "They had Donkey Punch too..."
His eyes travel down to the guys' muscular butts, pushing out the seats of their white cotton rugby shorts. The bartender's smirk turns into a broad grin. "They're going to love what it does to them!"