A man walks into a bar and orders an alcoholic drink for his pet fish.
He says to the bartender "I'd like two shots of whiskey please."
The bartender looks confused but pours him two shot glasses full of whiskey anyway.
The man then takes both glasses over to where he has set up an aquarium on top of one of the tables, and carefully tips each glass so the fish inside it can swim out onto the tabletop. The fish take turns drinking straight from the shot glasses until eventually falling asleep drunk under a nearby chair.

The bartender watches all this unfold without saying anything at first; however after about half an hour passes by with no sign of either customer or pets leaving anytime soon - let alone paying their tab! - she finally approaches them cautiously...

"I'm sorry sir," she begins hesitantly, "but I think there might be some kind of misunderstanding here..."

"What's wrong?" asks the man defensively as if expecting another argument about how inappropriate this behavior is within these premises (which admittedly would not look good on Yelp reviews).

"The thing is..." continues the bartender slowly choosing her words carefully "...you see those aren't actually real fish in that tank." She points towards the aquarium where only empty shot glasses now rest atop pebbles lining its bottom surface. "They're just...little plastic figurines shaped like tiny goldfish."