The bartender serves him and says: "Hey, Hitler. It's been a long time. What's going on with you?"
"I'm so glad you asked!", says Hitler, "I've had the most amazing idea!"
The bartender says: "Oh yeah? What's that?"
Hitler takes a long sip of his beer, wipes the foam from his mustache with the back of his hand, and says: "I'm going to murder six million Jews and seven plumbers."
The bartender, a perplexed look upon his face, asks: "Why seven plumbers?"
Hitler grins in triumph and smacks the polished wooden bar so hard that his beer sloshes out of the glass.
"You see?", he exclaims, "Nobody cares about the Jews!"